A dog microbiome test analyses a faecal sample to report which bacterial groups live in your dog's gut. In the UK you can buy a postal kit directly, or your vet can request a Dysbiosis Index through a veterinary laboratory — and those two routes answer different questions. Only the second has published canine validation behind it.
Two different tests, one name
Direct-to-consumer postal kits sequence 16S rRNA and return a long list of bacterial taxa scored against the company's own reference group. Broad, descriptive, and usually accompanied by product suggestions.
The Dysbiosis Index (DI), developed at the Texas A&M Gastrointestinal Laboratory and requested through veterinary labs, runs quantitative PCR on eight defined targets — total bacteria, Faecalibacterium, Turicibacter, Escherichia coli, Streptococcus, Blautia, Fusobacterium and Clostridium hiranonis — and returns a single number. Negative means normobiosis, positive means dysbiosis (AlShawaqfeh et al., FEMS Microbiology Ecology, 2017).
The validation matters. Faecal DNA from 95 healthy dogs and 106 dogs with histologically confirmed chronic inflammatory enteropathy, split into training and validation sets, gave 74% sensitivity and 95% specificity at a threshold of zero. A positive result carries weight; a negative one does not clear your dog.
| Postal consumer kit | Veterinary Dysbiosis Index | |
|---|---|---|
| Method | 16S rRNA sequencing | qPCR, 8 defined targets |
| Result | Long taxa list, in-house scoring | One number, negative or positive |
| Canine validation published | Varies; often none peer-reviewed | 95 healthy vs 106 chronic enteropathy dogs |
| Requested by | Owner | Your vet, through a veterinary laboratory |
| Read alongside | Product recommendations | History, bloods, faecal parasitology, sometimes biopsy |
What skews a UK result before any supplement does
- Recent metronidazole. A 14-day course in healthy dogs significantly reduced faecal richness, dropped key taxa such as Fusobacteria, significantly raised the Dysbiosis Index, and the changes had not fully resolved four weeks after stopping (Pilla et al., JVIM, 2020). Test too soon and you are measuring the drug.
- A recent food change. Abrupt dietary transitions alter digestive function and gut microbiota in dogs (Journal of Animal Science, 2025).
- Sampling and posting. One stool, one day, then time in the post. Ask the provider how the sample is stabilised in transit before you buy.
- Undiagnosed EPI. Dogs with exocrine pancreatic insufficiency showed raised E. coli, Lactobacillus and Bifidobacterium, reduced Fusobacterium and C. hiranonis, and a higher Dysbiosis Index than healthy dogs (Blake et al., PLoS ONE, 2019). German Shepherds are over-represented for EPI in UK practice, and a TLI blood test answers it directly.
Should you test?
- Healthy dog, firm stools, curiosity. A report is unlikely to change your routine. Consistency of feeding will do more.
- Chronic loose stools, weight loss, blood, vomiting. Book with your vet. Faecal parasitology, bloods and a TLI test answer more, faster.
- Diagnosed chronic enteropathy. The DI can be a reasonable monitoring tool when your vet requests it, particularly around antibiotic courses.
- Report already in hand saying "dysbiosis". Take it to your vet rather than shopping the suggestions at the bottom. Our dysbiosis in dogs guide explains the term.
What nobody can honestly claim
No published canine trial shows that any probiotic — ours included — normalises the Dysbiosis Index or shifts a microbiome test result to order. Dysbiosis is consistently observed alongside chronic gastrointestinal disease rather than proven to cause it (Suchodolski, The Veterinary Journal, 2016; Suchodolski, Veterinary Clinical Pathology, 2022), and reduced diversity in chronic enteropathy has been linked with lower faecal short-chain fatty acids (Minamoto et al., JVIM, 2019) — a mechanism, not a proven product benefit. We set it out in short chain fatty acids in dogs.
In Great Britain, gut supplements for dogs are sold as complementary feed, not as VMD-authorised veterinary medicines, and may not be marketed as treating or preventing disease. Any UK seller telling you a supplement will correct a test score is overstepping that line.
Where daily support fits
A test describes today; what you do daily afterwards is the part you control. Chews are palatable and suit plenty of homes perfectly well. A liquid earns its place when you want dose control by body weight, when your dog spits chews out, when appetite is poor on a bland diet, or when calories are being counted. Our 3B Liquid Probiotic Drops pair probiotics with prebiotics and digestive enzymes in one dropper, with free worldwide shipping, UK included. Compare formats in liquid vs powder vs chews, read the category overview in best probiotic for dogs, or start wider with the dog gut health complete guide. The full range is at Pure Majesty Pets.
When to ring your vet instead
Diarrhoea beyond 48 hours, blood or black tarry stool, repeated vomiting, lethargy, unexplained weight loss, or a puppy, senior or toy breed — book an appointment. A postal kit will not shorten any of those.
Frequently asked questions
Are dog microbiome tests accurate in the UK?
Accuracy depends on the test, not the country. The Dysbiosis Index has published canine validation of 74% sensitivity and 95% specificity; consumer postal kits vary and often have not published comparable data.
Can my vet request a Dysbiosis Index?
Veterinary laboratories offer microbiota panels to UK practices. Ask your vet which panel they use and what it will change in your dog's plan.
How long after antibiotics should I wait?
Metronidazole effects persisted beyond four weeks after the course ended in healthy dogs. Ask your vet for timing specific to your dog.
Will a probiotic change the result?
Current research does not strongly prove that any supplement normalises a canine microbiome test result.
Is testing worth it for a healthy dog?
Usually not. It is most useful when a vet orders it as part of investigating or monitoring a diagnosed gut problem.
Scientific References
- AlShawaqfeh MK, et al. A dysbiosis index to assess microbial changes in fecal samples of dogs with chronic inflammatory enteropathy. FEMS Microbiology Ecology. 2017;93(11). PMID: 29040443
- Suchodolski JS. Diagnosis and interpretation of intestinal dysbiosis in dogs and cats. The Veterinary Journal. 2016. PMID: 27160005
- Suchodolski JS. Analysis of the gut microbiome in dogs and cats. Veterinary Clinical Pathology. 2022. PMID: 34514619
- Pilla R, et al. Effects of metronidazole on the fecal microbiome and metabolome in healthy dogs. JVIM. 2020;34(5):1853-1866. PMID: 32856349
- Blake AB, et al. Altered microbiota, fecal lactate, and fecal bile acids in dogs with gastrointestinal disease. PLoS ONE. 2019;14(10):e0224454. PMID: 31671166
- Minamoto Y, et al. Fecal short-chain fatty acid concentrations and dysbiosis in dogs with chronic enteropathy. JVIM. 2019. PMID: 31099928
- Impact of an abrupt change from dry to canned diet on digestive function and gut microbiota in dogs. Journal of Animal Science. 2025. PMID: 40405061
Educational information only; it does not replace advice from your veterinary surgeon. Pure Majesty Pets products are complementary feed for dogs, not veterinary medicines, and are not intended to diagnose, treat, cure or prevent disease. Speak to your vet before starting any supplement.