Dog Paw Yeast Infection in Ireland: Causes, Treatment and Paw Soaks

Dog paw yeast infection with brown staining between the toes

Quick answer: A dog paw yeast infection is an overgrowth of Malassezia pachydermatis between the toes and on the paw pads, usually set off by allergies or trapped moisture — and in Ireland, where wet grass and mild, damp weather are a year-round fixture rather than a summer problem, damp paws are rarely in short supply. Relief comes from three things together: confirming it really is yeast, gently cleaning and drying the paws, and treating the cause from the inside out. A vinegar paw soak is a popular home step, but it is not strongly backed by clinical research and can sting broken or sensitive skin — so vet-supported topicals and an easy daily supplement are often more reliable. Mild cases ease in 1 to 2 weeks; recurring ones need veterinary care.

For daily support alongside your dog’s yeast-care routine, explore Pure Majesty Pets Yeast Support. Our ready-made liquid combines caprylic acid C8, apple cider vinegar and oregano with MSM, quercetin and salmon oil for skin support, plus L-glutamine and a S. boulardii postbiotic for digestive support. Mix the finished formula into food according to its label; it complements veterinary care and does not replace treatment for an active infection.

What a dog paw yeast infection actually is

Yeast is a normal resident on every dog’s skin. The organism behind most paw infections is Malassezia pachydermatis, a fungal species that lives quietly in small numbers as part of the skin’s normal flora. Trouble starts when something tips the balance and the presence of yeast multiplies out of control — a condition vets call yeast dermatitis. The paws are the perfect breeding ground: they trap moisture, collect allergens from grass and floors, and stay warm and dark between the toes, where yeast cells and other yeast organisms thrive. A localised flare on one affected paw can spread into a pattern of chronic yeast infections across all four feet. When inflammation settles into the paw itself, clinicians call it pododermatitis — and yeast is one of its most common causes. For the clinical view of this overgrowth, see our explainer on yeast dermatitis in dogs.

What yeasty dog paws look like: the signs

Dog paw yeast infection between the toes with redness and rusty-brown staining of the webbing

Paw yeast tends to share a recognisable cluster of signs. Watch for:

  • Persistent licking and excessive licking, chewing, or biting at the feet, often worse at night
  • Rust- or copper-coloured saliva staining of the fur between the toes and around the paw pads
  • Redness and swelling in the webbing of the affected paw
  • A distinctive musty, “corn-chip” odour
  • Greasy, flaky or crusty skin, sometimes with a waxy brown film
  • Darkened, thickened, “elephant-hide” skin (lichenification) in long-standing cases

The brown staining is the telltale clue: it comes from porphyrin pigments in saliva, which is why owners of white-coated dogs usually notice it first. The same overgrowth can affect the nail beds — in dogs, and far less commonly around cat nails — so check the base of each claw too. If the nails themselves look rust-stained and brittle, read our guide to dog nail bed yeast infection. To compare what overgrowth looks like elsewhere on the body, our dog skin yeast infection pictures show the early and advanced stages side by side.

Related guides for the next steps

If your dog will not stop licking, chewing or nibbling at their feet — and you have spotted a rusty-brown stain creeping across the fur between their toes, sometimes with a musty odour — there is a good chance you are looking at a dog paws yeast infection. It is one of the most common and most stubborn skin problems pet owners deal with, and it is especially frustrating in a mild, rainy maritime climate like Ireland’s, where feet rarely get a proper chance to dry out between walks. This guide covers exactly how to recognise it, how to clean and soak the paws safely (and where a vinegar soak falls short), and — the part most articles skip — how to stop it coming back. For the whole-body picture, see our complete guide to dog yeast infection.

Yeast, bacteria or allergies? How to tell them apart

Here is what generic articles gloss over: red, licked-raw paws are not automatically yeast. Yeast, bacterial infections and plain allergic inflammation look alike to the naked eye but respond to very different treatments — which is why an accurate diagnosis matters before you commit to a plan. Use this table as a starting point, not a substitute for your vet.

Clue Yeast overgrowth Bacterial infection Allergy only (no infection yet)
Smell Musty “corn-chip” odour Sour or foul; sometimes none Little to no smell
Discharge Brown, greasy, waxy film Pus, yellow crusts, moist sores Dry, flaky, or just red
Staining Rusty-brown between toes Variable Saliva stain from licking, no waxy film
Best confirmed by Cytology (skin scrapings/tape under a microscope) Cytology, sometimes culture Response to allergy management

The only way to be sure is cytology: your vet takes skin scrapings or a tape sample from between the toes and looks for the peanut- or footprint-shaped yeast cells under the microscope. These diagnostic steps take minutes and change everything — because if bacteria are involved too (they often are), a vinegar soak alone will not fix it. Trustworthy veterinary websites and your own practice are far better guides here than guesswork, especially for a first flare.

Common causes of yeast on dog paws

Dog licking its paw, showing the brown saliva staining typical of paw licking from yeast

Paw yeast is almost always a symptom of a deeper imbalance rather than a standalone disease. The common causes include:

  • Allergies — the number-one driver. Environmental and food allergies inflame the skin and weaken its protective barrier. Dogs with allergies need ongoing allergy management, not just surface cleaning, or the yeast simply returns.
  • Trapped moisture. Swimming, wet grass, rain-soaked pavements or constant licking keeps the webbing damp — exactly the microclimate yeast needs.
  • A disrupted gut and immune system. Antibiotics and a high-carbohydrate diet upset the gut microbiome, which is linked to skin defence through the gut–skin axis. A weakened immune system leaves dogs prone to yeast infections.
  • Sugar- and starch-heavy food. High-glycaemic dry food and starchy treats raise blood sugar and can feed yeast from the inside out.
  • Warm, humid conditions. Heat and humidity accelerate overgrowth, which is why flares spike in summer and in wet climates.

Paw soaks for yeast: what they can and cannot do

A paw soak can help clean and dry the webbing between the toes, and many owners reach for diluted apple cider vinegar (ACV) first because it makes the surface mildly acidic. Be realistic about it, though: home vinegar soaks are not well supported by clinical research in dogs, and vinegar can sting raw, cracked or sensitive skin. Think of a soak as basic hygiene that buys some comfort — not a treatment that clears the infection on its own. If you do use one, keep it gentle and stop at the first sign of irritation. Cap each soak at around 5 minutes, once daily — over-soaking can dry and crack the paw pads and trade one problem for another. Here is a careful routine:

  1. Mix equal parts raw apple cider vinegar and warm water in a shallow basin (a 50/50 dog paw yeast infection soak).
  2. Soak each paw for 2 to 5 minutes, gently working the solution into the webbing and paw pads.
  3. Lift the paws out and blot — do not rinse.
  4. Dry thoroughly between every toe with a clean towel. This step is non-negotiable; leftover moisture undoes all your work.
  5. Repeat once or twice daily until the staining and odour fade, then taper to 2 or 3 times a week for maintenance.

Skip the vinegar soak entirely on raw, cracked or bleeding skin — it stings and can make things worse. Because home soaks carry limited evidence, the better-supported topical is a medicated one: the World Association for Veterinary Dermatology’s consensus guidelines rate a 2% chlorhexidine plus 2% miconazole shampoo, used twice weekly, as the topical approach with the strongest evidence in dogs — so a chlorhexidine-based paw soak or foam is a more defensible choice than vinegar for stubborn paws. Whatever you use on the surface, good day-to-day paw hygiene — wiping paws after walks, trimming the fur between the pads, keeping nails short — is the paw care that keeps the area dry between treatments. For an honest look at which home remedies actually deliver, read our breakdown of dog yeast infection home remedies.

Why paw soaks alone often fail

Most owners do everything right on the surface and still watch the infection roar back a week later. There are two reasons, and understanding them is what separates a temporary fix from a real one. First, Malassezia and its bacterial neighbours form biofilms — sticky, protective matrices that shield the yeast from anything applied briefly to the surface. In the laboratory, medium-chain fatty acids such as caprylic acid can disrupt fungal cell membranes and interfere with biofilm and filament formation, and N-acetyl-cysteine can reduce the thickness of established Candida biofilms. Two honest caveats: much of this work is in vitro and on related yeasts like Candida and Malassezia furfur, so it points to a plausible mechanism rather than proving what happens on a living dog’s paw. Second, a topical soak does nothing about the driver underneath — the allergy, the inflammation, the gut imbalance. That is why the dogs who truly recover are treated on both fronts: surface and source.

Treatment options compared

Effective treatment clears the yeast off the surface and addresses the internal drivers so it does not come straight back. Here is how the main treatment options stack up:

Option What it does Best for
Antifungal paw soak (chlorhexidine preferred; ACV = limited evidence) Cleans and dries the surface, soothes itch Daily home care, mild cases
Medicated wipes / antifungal creams Spot-treat between toes and paw pads Targeted areas, on-the-go paw care
Antifungal shampoo (chlorhexidine + miconazole) Whole-foot surface control, WAVD strong-evidence rating Multi-paw or widespread cases
Vet antifungal medicines (oral medicines) Systemic control of severe overgrowth Painful, stubborn or recurring cases — needs prompt treatment
Inside-out support (diet + gut/skin) Targets the root cause behind relapses Long-term prevention

Surface treatments alone rarely keep paw yeast away, because the real driver is still in play. Our guide to what actually works for a dog yeast infection explains why a combined approach beats any single product.

Treating paw yeast from the inside out

To break the cycle, pair your topical routine with internal support. Start with diet: cut back on high-glycaemic dry food, sugars and starchy treats that feed yeast, and lean on lean proteins and low-glycaemic vegetables. Then support the gut–skin axis and immune system, which govern how well your dog’s skin can defend itself — the connection researchers have documented between the intestinal microbiota and canine skin disease. Dogs that obsessively lick their feet often benefit from gut support, which is exactly what our Liquid Probiotic for Dogs is built for; our article on dog probiotics for yeast explains how postbiotics and the gut–skin axis fit in. Where the underlying driver is an itchy, allergic skin barrier, pair that with Dog Allergy Relief & Itchy Skin Chews and, for coat and skin-barrier support over the longer term, our Vet-Strength Liquid Collagen for Dogs.

What to look for in a yeast supplement (and the red flags)

The supplement aisle is full of single-note products that sprinkle a token amount of one ingredient and call it a yeast formula. Before you buy, judge any product against this checklist:

  • Multi-axis, not single-note. Paw yeast has three moving parts — the yeast itself, the inflamed skin barrier, and the gut. A serious formula addresses all three.
  • Disclosed doses. If a label hides amounts inside a “proprietary blend”, you cannot tell whether the active ingredients are present at meaningful levels or just fairy-dusted for the label.
  • Honest postbiotic claims. Many “probiotic” yeast products are actually postbiotics (non-living cell-wall fractions). That is fine — but the label should say so rather than imply live cultures it cannot guarantee.
  • Made for the root cause. A product built only to mask smell or itch will disappoint. Look for skin-barrier and gut-tolerance ingredients alongside the antifungal botanicals.
  • Red flags: vague “detox” promises, cure claims (no supplement can legally claim to cure), no dosing transparency, and no veterinary caveats.

How our Yeast Infection Drops target the root cause

This is where our dog yeast infection treatment drops come in — and for most owners they are simply easier to keep up than a nightly vinegar soak: a palatable, flavoured liquid you add to food (most dogs take it happily), built vet-strength with 19 actives across three systems at once, every dose disclosed on the label. We will not claim the finished product is clinically proven to cure yeast — no honest supplement can — but every active is chosen from published antifungal, skin or gut research. Here is the design, in plain terms:

System Key actives (per 1 mL) What the research supports
1. Yeast balance Caprylic acid / MCT C8 (45 mg), oregano at 70% carvacrol (~2.8 mg carvacrol), berberine from Berberis aristata (15 mg), apple cider vinegar (18 mg), N-acetyl-cysteine (18 mg), Pau D’Arco (8 mg) Caprylic acid and carvacrol have shown antifungal activity against yeast — including Malassezia furfur — in laboratory (in vitro) studies; NAC can reduce yeast biofilms in the lab. These are mechanism findings on related yeasts, not proof of a cure on a dog’s paw. Berberine and Pau D’Arco are traditional antimicrobial botanicals (direct canine evidence is limited).
2. Skin comfort & barrier MSM (45 mg), Wild Pacific salmon oil (35 mg), quercetin (15 mg), calendula (8 mg), zinc (2 mg elemental) Omega-3 fatty acids from fish oil are shown to help calm the itch–inflammation cycle and support the skin barrier in dogs; zinc and quercetin are commonly used for skin and antioxidant support.
3. Digestive tolerance (gut–skin axis) L-glutamine (25 mg), Saccharomyces boulardii postbiotic (20 mg), pumpkin, slippery elm, marshmallow root, DGL liquorice, aloe inner leaf, ginger A soothing, gut-supportive base intended to help the microbiome that underpins skin defence. The S. boulardii here is a stabilised postbiotic (cell wall), not a live-CFU probiotic — and we say so.

That is the difference between a formula that chases symptoms and one engineered for the root cause: it supports the yeast balance, the paw pad skin and the gut in a single daily dose your dog actually wants to take, at amounts you can read on the label. It is supportive supplement care that complements diet, paw care and any veterinary treatment — not a medicine, and not a cure. Explore the full yeast relief range, or learn more about our approach to natural canine health on our homepage.

Paw yeast care in Ireland: damp walks, vet medicines and getting the products delivered

Ireland gives paw yeast an unusually easy ride, and it is worth planning around that rather than fighting it flare by flare.

  • There is no dry season to wait for. Ireland’s mild, wet Atlantic climate means rain is spread across the whole year rather than concentrated in one wet season, so the towel-by-the-door habit is a permanent routine here, not a winter one. Wet grass on a morning field walk, soft ground on a coastal or bog path, and a soaked dog drying slowly indoors all keep the webbing between the toes damp for hours.
  • Trim, then dry, then check. Heavily feathered feet on spaniels, setters, retrievers and doodle crosses hold water for a long time after a walk. Keeping the fur between the pads short and blotting each gap between the toes does more for a damp-climate dog than any product you can buy.
  • Prescription antifungals come through your vet. Veterinary medicines in Ireland are regulated by the Health Products Regulatory Authority (HPRA), and vets practising here are registered with the Veterinary Council of Ireland. That means oral antifungals and medicated shampoos for a confirmed infection go through your own practice — a supplement, ours included, never substitutes for that.
  • Do not import a prescription workaround. If a stubborn paw needs cytology and a prescription, that is a clinic visit, not an online order. Use daily support for what it is good at: keeping the routine going between appointments.

On the ordering side, we have made the Irish part simple. Pure Majesty Pets ships free worldwide, and delivery to Ireland is DDP — delivered duty paid: import duties and VAT are settled up front, so there is nothing extra to pay the courier at your door and no customs charge waiting at the end. Pricing shows in euro. Every batch is manufactured in North America to GMP standards and released with a certificate of analysis (COA), and the range is rated around 4.6/5 across roughly 1,085 reviews. If your dog’s ears are flaring alongside the paws — common when the same allergy is driving both — our Dog Ear Cleaner handles the surface while the drops work on the cause.

What to realistically expect: a healing timeline

Setting honest expectations is half the battle, because owners who know the timeline do not quit early — and quitting early is the single biggest reason paw yeast relapses.

  • Days 1–3: Less frantic licking as the soak lowers surface yeast and calms the itch. The odour usually softens first.
  • Week 1–2: Brown staining fades from the fur; redness and swelling ease in the webbing. Most mild cases visibly improve here.
  • Week 2–4: Skin texture normalises as the barrier recovers. This is where inside-out support earns its keep.
  • Week 4–6+: Thickened, darkened “elephant-hide” skin from chronic cases is the slowest to turn over. Keep going.

What you should not expect: an overnight cure, or a permanent fix from the soak alone. If there is no improvement at all within 1 to 2 weeks, that is your cue to involve your vet — the diagnosis or the treatment plan needs adjusting.

Paw yeast by dog profile

The same infection needs slightly different handling depending on the dog in front of you:

  • The allergic dog: Surface care buys comfort, but lasting relief depends on allergy management with your vet. Expect to treat the allergy for life, not just the flare.
  • The swimmer / active dog: Dry the paws after every swim, walk or bath. Moisture control matters more than any product.
  • The senior dog: A weaker immune system and slower skin turnover mean flares take longer to clear — be patient and consistent, and rule out endocrine issues with your vet.
  • The heavy-coated breed or doodle: Fur between the pads traps damp and debris. Keep it trimmed; it is the cheapest prevention there is.
  • The sensitive-stomach or fussy eater: Choose a gentle, gut-soothing inside-out support and introduce diet changes gradually so you do not trade a skin problem for a digestive one.

Mistakes that keep paw yeast coming back

  • Skipping the drying step. A soak followed by damp toes is worse than no soak at all.
  • Stopping the moment it looks better. Taper down; do not quit cold. The yeast rebounds fastest right after improvement.
  • Treating only the surface. If you never touch the diet, gut or allergy, you are signing up for future yeast infections every season.
  • Reaching only for steroids. They calm itch but can suppress local defences; used alone and long-term, they can make yeast worse. Use them only under veterinary guidance.
  • Over-bathing. Stripping the skin barrier with harsh, frequent washing backfires. Targeted paw care beats whole-dog scrubbing.
  • Guessing instead of confirming. Without cytology you may be treating yeast when bacteria (or both) are the real story.

Myth vs fact: paw yeast edition

Myth Fact
“Rubbing coconut oil on the paws cures yeast.” Caprylic acid (found in coconut oil) has shown antifungal activity in laboratory studies, but a film of oil on the paw traps moisture, attracts dirt and gets licked straight off. There is no clinical evidence that topical coconut oil clears canine paw yeast.
“An Epsom salt soak kills the yeast.” Warm water can soothe irritated feet, but Epsom salt has no demonstrated antifungal effect against Malassezia. If you want a soak with evidence behind it, a chlorhexidine-based product is the better-supported choice.
“Grain-free food fixes paw yeast.” Malassezia feeds mainly on skin oils, not dietary grains. Food can matter — food allergy is one recognised driver of the underlying skin inflammation — but simply switching to grain-free rarely resolves the problem on its own.
“Shaving the paws helps them heal.” Clipping razor-close can irritate the skin further. Trimming the fur between the pads short enough to let air circulate is the useful middle ground.

When to see your veterinary surgeon

Home care helps many mild cases, but book veterinary care if your dog’s paws do not improve within 1 to 2 weeks, if you see severe swelling, limping, pus or bleeding, or if the infection keeps coming back. An out-of-hours or emergency veterinary visit is the right call for painful or rapidly worsening paws, because stubborn cases need prompt treatment — sometimes prescription antifungal medicines or a short course of oral medicines, guided by cytology for an accurate diagnosis. Recurrent paw yeast is usually a sign of an underlying allergy that deserves a proper workup rather than another round of soaks.

How to prevent future paw yeast infections

Prevention is mostly about denying yeast the warmth and moisture it loves while keeping the skin barrier strong. Dry the paws after every walk, swim or bath; keep up gentle paw hygiene and paw care; manage allergies with your vet; hold the line on a lower-starch diet; and support the gut and immune system daily. Dogs that are prone to yeast infections — heavy-coated breeds, dogs with allergies and swimmers — benefit most from this routine, which is what turns chronic yeast infections into rare, manageable flares rather than a fixture of every damp Irish month.

Frequently Asked Questions

What does a yeast infection on a dog’s paw look like?

Expect redness and swelling between the toes, rusty-brown saliva staining on the fur, a greasy or flaky texture on the paw pads, and often a musty “corn-chip” odour. In chronic cases the skin thickens and darkens into an “elephant-hide” look.

How do I get rid of yeast on my dog’s paws?

Combine a daily diluted-vinegar paw soak with thorough drying, reduce dietary sugars and starches, and add inside-out support to address the root cause. Consistency over 2 to 4 weeks is key, and confirm the diagnosis with your vet if it does not budge.

What can I soak my dog’s paws in for yeast?

A 50/50 apple cider vinegar and water soak is the most popular home option, but it is not strongly backed by clinical research and can sting sensitive skin. Chlorhexidine-based solutions are a more evidence-supported, vet-recommended choice. Avoid any soak on open or cracked skin.

What can you spray on a dog’s paw for yeast infection?

Diluted chlorhexidine or an antifungal spray/foam can help between soaks, and medicated wipes work for spot-treating the webbing. Sprays lower surface yeast but do not reach the underlying driver, so pair them with drying, diet and inside-out support.

What is the best treatment for a yeast infection between a dog’s toes?

For yeast between the toes, gentle cleaning and thorough drying help the surface, a vet-recommended medicated (chlorhexidine/miconazole) product is better supported than a vinegar soak, and diet plus gut/skin support address the cause. Severe or recurring cases need vet-prescribed antifungal medicines.

How is paw yeast different from a bacterial infection?

They look similar but respond to different treatments. Yeast usually brings the musty odour and brown, waxy staining; bacterial infections may bring pus or moist sores. Only cytology (skin scrapings under a microscope) gives an accurate diagnosis — which is why a vet visit matters for stubborn paws.

Will a dog’s paw yeast infection go away on its own?

Rarely. Because paw yeast is usually driven by allergies or moisture, it tends to persist or worsen without intervention. Treating both the surface and the underlying cause gives the best results.

How long does a dog paw yeast infection take to heal?

With consistent care, a mild dog paws yeast infection often improves within 1 to 2 weeks, while chronic, darkened or recurring cases can take 4 to 6 weeks or longer. Daily soaks, thorough drying, a lower-starch diet and treating the underlying allergy all speed recovery.

Can I use human antifungal cream on my dog’s paws?

Some human antifungal creams share ingredients with veterinary products, but dogs lick their paws and can ingest what you apply, and the wrong strength or base can irritate. Ask your vet before using any human antifungal creams, and never assume the dose is the same.

Is dog paw yeast contagious to other pets or people?

Malassezia overgrowth is generally not considered contagious; it reflects an imbalance on that individual dog’s skin rather than an organism that spreads between healthy pets or their owners.

Why does my dog keep getting paw yeast infections?

Recurrence almost always points to an unmanaged root cause — usually allergies, a damp environment or gut imbalance. In a climate as consistently wet as Ireland’s, the damp-environment part rarely goes away on its own, so lasting prevention means allergy management, paw hygiene and daily gut–skin support, not just repeating soaks.

Is pododermatitis the same as a dog paw yeast infection?

Pododermatitis simply means inflammation of the paw, and yeast is one of its most common causes — so a yeast infection pododermatitis dog paw is often the same problem described in clinical terms. Because red, licking paws also overlap with allergies and bacterial infections, confirm with your vet if the paw pads stay inflamed despite daily soaking and drying.

Do you deliver to Ireland, and will I be charged customs?

Yes. Pure Majesty Pets ships free worldwide and delivers to Ireland on a DDP (delivered duty paid) basis, so duties and VAT are covered before dispatch and there is nothing further to pay on delivery. Prices are shown in euro, and every batch is made in North America under GMP with a certificate of analysis.

Scientific References

  1. Bond R, Morris DO, Guillot J, et al. Biology, diagnosis and treatment of Malassezia dermatitis in dogs and cats: Clinical Consensus Guidelines of the World Association for Veterinary Dermatology. Vet Dermatol. 2020;31(1):27-e4. (PMID 31957203; doi:10.1111/vde.12809)
  2. Chen TA, Hill PB. The biology of Malassezia organisms and their ability to induce immune responses and skin disease. Vet Dermatol. 2005;16(1):4-26.
  3. Negre A, Bensignor E, Guillot J. Evidence-based veterinary dermatology: a systematic review of interventions for Malassezia dermatitis in dogs. Vet Dermatol. 2009;20(1):1-12.
  4. Bergsson G, Arnfinnsson J, Steingrímsson Ó, Thormar H. In vitro killing of Candida albicans by fatty acids and monoglycerides. Antimicrob Agents Chemother. 2001;45(11):3209-3212.
  5. Vinciguerra V, Rojas F, Tedesco V, Giusiano G, Angiolella L. Chemical characterization and antifungal activity of Origanum vulgare, Thymus vulgaris essential oils and carvacrol against Malassezia furfur. Nat Prod Res. 2019;33(22):3273-3277. (PMID 29726703)
  6. Nunes TSBS, Rosa LM, Vega-Chacón Y, Mima EGO. Fungistatic action of N-acetyl-cysteine on Candida albicans biofilms and its interaction with antifungal agents. Microorganisms. 2020;8(7):980. (doi:10.3390/microorganisms8070980)
  7. Mueller RS, Fieseler KV, Fettman MJ, et al. Effect of omega-3 fatty acids on canine atopic dermatitis. J Small Anim Pract. 2004;45(6):293-297. (PMID 15206474)
  8. Craig JM. Atopic dermatitis and the intestinal microbiota in humans and dogs. Vet Med Sci. 2016;2(2):95-105.

This article is educational and not a substitute for veterinary advice. Always consult your veterinary surgeon before starting a new supplement or treatment, particularly if your dog has an existing medical condition or is on medication.