Quick answer
For everyday gut support, our pick is AyurPet GoodGut+, an Ayurvedic herbal formula, not a live probiotic. If you want a true probiotic, Purina FortiFlora is the best-documented in the UK. Pro-Kolin Advanced, Protexin Synbiotic D-C and YuMOVE Digestive Care use the same bacterial strain in different formats.
Maybe it started after a course of antibiotics. Or the new food. Or it just never quite settled: soft stools on Monday, fine on Wednesday, a long night of gurgling on Friday. So you search "probiotics for dogs UK" and find a dozen pastes, sachets and tablets that all sound different.
Here is something the packaging will not tell you: most of the UK's best-known dog probiotics contain the same bacterium. Once you know that, choosing gets much simpler. We also make a gut formula, GoodGut+, and we will be straight about what it is and is not.
Why do so many UK dog probiotics contain the same strain?
In the UK, a probiotic added to pet food or a supplement must be an authorised feed additive, a "gut flora stabiliser", and very few bacterial strains are authorised for dogs. The one you will see again and again is Enterococcus faecium NCIMB 10415, labelled with the code 4b1705 or 4b1707.
The two codes are separate authorisations for preparations of the same strain; the 4b1707 preparation, for example, was re-authorised for dogs and cats as a gut flora stabiliser under EU Regulation 2015/1053, the regime the UK's feed rules grew from. Check the "additives" line on the back of the pack: FortiFlora lists E. faecium SF68 NCIMB 10415 (4b1705), while Pro-Kolin Advanced, Synbiotic D-C and YuMOVE Digestive Care list E. faecium DSM 10663/NCIMB 10415 (4b1707 or E1707).
So between these four you are mostly choosing a format, a dose and the extras around the bacterium (clays, fibre, prebiotics), not a different microbe.
Read this graphic as text
Probiotics for dogs · UK
Four brands, one bacterium
Turn the pack over and read the additives line. The UK's best-known dog probiotics list the same strain.
Enterococcus faecium NCIMB 10415
An authorised "gut flora stabiliser" feed additive, labelled 4b1705 or 4b1707
Purina FortiFlora
SF68 · 4b1705
Min 500 million CFU per 1 g sachet, once daily
Pro-Kolin Advanced
4b1707
200 million CFU per gram, plus clays, pectin and psyllium
Synbiotic D-C
4b1707
2 billion CFU per capsule, plus a prebiotic
YuMOVE Digestive Care
E1707
200 million per tablet, plus MOS, scFOS and beta-glucans
AyurPet GoodGut+ is different
An Ayurvedic herbal formula with no live bacteria: Triphala, milk thistle, Bhumi Amla, Yashtimadhu, slippery elm, Bhringraj, ginger, fennel, cumin and black pepper.
Sources: Purina Veterinary Centre UK guide; Protexin and Lintbells product pages (October 2026); EU Regulation 2015/1053.
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Do probiotics actually work for dogs?
For a short bout of diarrhoea, probiotics may shorten it slightly, but the effect in dogs is small and the trials are small. For long-running gut problems, diet does more. That is the honest summary of the research, and it shapes how we rank.
A 2019 systematic review of 17 dog studies found "a very limited and possibly clinically unimportant effect" for acute gut upsets, and no clear added benefit over diet for chronic disease. In a 2019 placebo-controlled trial of 60 dogs with acute diarrhoea, dogs on a probiotic reached normal stools in 3.5 days on average, versus 4.6 days on metronidazole and 4.8 on placebo: encouraging, but not statistically significant. Quality matters too. When researchers tested 25 veterinary probiotic products, only 2 had both an acceptable label and the claimed count, which is one reason to choose a named, authorised strain.
For the bigger picture on stools, fibre and when to worry, see our dog gut health guide.
#1 Best overall for everyday gut support: AyurPet GoodGut+
GoodGut+ is our pick for dogs whose digestion is a bit unsettled day to day and whose owners want herbal, food-based support rather than another dose of bacteria. It contains no live probiotic. It is a liquid blend of ten Ayurvedic herbs and spices, built around Triphala and milk thistle, stirred into meals.
#1 Our top pick · Best overall for everyday gut support
AyurPet GoodGut+ digestive drops
Why it leads for everyday support
- The whole gut, not one microbe: Triphala (three fruits Ayurveda has used for centuries to keep digestion regular), milk thistle and Bhumi Amla for the liver side of digestion, Yashtimadhu (liquorice root) and slippery elm for the gut lining, and fennel, ginger, cumin and black pepper, the kitchen spices of an Indian meal.
- Food-first thinking: it works alongside the bowl, where most lasting gut change happens, rather than adding another isolated ingredient.
- Liquid drops: nothing to break down ("Liquid absorbs. Chews guess."), and easy to mix into wet food.
- Clean label: 100% Ayurvedic, human-grade ingredients, lab tested and certified, no added chemicals.
- Owner proof: rated 4.7 stars from 51 reviews.
Honest cons
- It is not a probiotic and contains no live bacteria; if your vet has asked for a probiotic, use one of the products below.
- Research on these herbs in dogs is still catching up with tradition: milk thistle has been studied mainly for liver injury, and Triphala and slippery elm have no dog trials yet. It ships from theayurpet.store rather than UK shops.
Read more on the herbs in our guides to Triphala for dogs and milk thistle for dogs.
The UK probiotics, reviewed
2. Purina Pro Plan FortiFlora. Best pure probiotic.
Purina's UK vet guide lists E. faecium SF68 NCIMB 10415 (4b1705) at a minimum 5 x 108 CFU per gram, in a 1 g sachet sprinkled on food once a day, continued until at least a week after stools are normal. Pros: one named, microencapsulated strain with the longest research history, a palatable meat base, and Purina says it is safe from weaning and in pregnant or nursing dogs. Cons: its base is pork and poultry derivatives, and Purina itself says it is not recommended for dogs with specific food allergies; the dog evidence for SF68 is modest, as the review above shows.
3. Protexin Pro-Kolin Advanced. Best for: a short-term upset, in a paste.
Protexin lists E. faecium DSM 10663/NCIMB 10415 (4b1707) at 2 x 108 CFU per gram, plus kaolin and montmorillonite clays, pectin, psyllium, a prebiotic (oligofructose and acacia) and beta-glucans, given twice daily by syringe for 2 to 3 days or as your vet advises. Pros: the binders and fibre firm stools quickly; liver-flavoured paste is easy to give. Cons: designed for short courses, not daily use; the probiotic dose per syringe is not stated on the page.
4. Protexin Synbiotic D-C. Best for: the highest count in one capsule.
The same 4b1707 strain at 2 x 109 CFU per capsule, with the Preplex prebiotic, once daily, according to Protexin. Pros: a clear per-dose count, and the capsule can be opened onto food or hidden in a treat. Cons: no fibre or binders for a sudden upset, and no dog-specific dose by weight on the page.
5. YuMOVE Digestive Care Pre & Probiotic. Best for: a daily tablet from a high-street brand.
Per Lintbells, each tablet has 200 million E. faecium DSM 10663/NCIMB 10415, plus a prebiotic complex of MOS, scFOS and beta-glucans; 1 tablet up to 10 kg, 2 for 11 to 25 kg, 3 for 26 to 40 kg and 4 above, from 12 weeks. Pros: dosed by weight, prebiotic-rich, six-week money-back guarantee. Cons: a 30 kg dog takes three tablets a day; the count per tablet is lower than Synbiotic D-C's capsule.
The UK comparison table
| Product | What it is | Live bacteria (brand-listed) | Use | Best for |
|---|---|---|---|---|
|
AyurPet GoodGut+ #1 OUR TOP PICK |
Ayurvedic herbal drops | None (herbal) | Daily with meals | Best overall everyday gut support |
| Purina FortiFlora | Probiotic sachet | E. faecium SF68 (4b1705), min 500 million CFU per sachet | Daily, short or long term | Best pure probiotic |
| Pro-Kolin Advanced | Probiotic paste with clays and fibre | E. faecium (4b1707), 200 million CFU per gram | 2 to 3 days | Sudden loose stools |
| Synbiotic D-C | Probiotic capsule | E. faecium (4b1707), 2 billion CFU per capsule | Once daily | Highest count per dose |
| YuMOVE Digestive Care | Pre- and probiotic tablet | E. faecium (E1707), 200 million per tablet | Daily, by weight | High-street daily tablet |
How to choose for your dog
Match the product to the problem, not the advert. Start with the most likely cause, and remember that the bowl matters more than any sachet.
- A one-off upset in a bright, eating dog: a few days of Pro-Kolin Advanced or FortiFlora, bland food, plenty of water. If it lasts more than 48 hours, see your vet.
- During antibiotics: ask your vet; Purina advises giving FortiFlora at least two hours apart from the antibiotic and for a week after.
- Wobbly digestion that comes and goes, gas, a fussy appetite: GoodGut+ daily, a steady diet, and fewer extras.
- Food allergy: FortiFlora's base is pork and poultry, so ask your vet which product suits your dog's diet; a herbal formula such as GoodGut+ adds no animal protein.
- Blood in stools, vomiting, lethargy, or a puppy with diarrhoea: vet first, supplements later. Our guide to diarrhoea in dogs covers the red flags.
Read this graphic as text
Probiotics for dogs · UK
Match the product to the problem
A one-off upset in a bright, eating dog
Pro-Kolin Advanced or FortiFlora for a few days, bland food, water. Vet if it lasts over 48 hours.
During a course of antibiotics
Ask your vet. Purina: FortiFlora 2 hours apart from the antibiotic, and for a week after.
Wobbly digestion that comes and goes, gas, fussy appetite
GoodGut+ daily, a steady diet and fewer extras.
Food allergy
Check the base. FortiFlora is pork and poultry; a herbal formula adds no animal protein.
Blood in stools, vomiting, lethargy, or a puppy with diarrhoea
Vet first. Supplements later.
Sources: Purina Veterinary Centre UK FortiFlora guide; Protexin Pro-Kolin Advanced directions (October 2026).
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AyurPet's take
A probiotic is a useful tool for a rough few days. But in Ayurveda, digestion is Agni, the digestive fire, and you look after it every day: regular mealtimes, warm rather than fridge-cold food, no constant snacking, and gentle spices in tiny amounts. That is the gap GoodGut+ is made for.
Try this tonight: serve dinner at room temperature, skip the extra treats, and add a teaspoon of plain cooked pumpkin or rice water if stools are soft. If your vet has prescribed a probiotic, keep it; GoodGut+ can sit alongside it.
Frequently asked questions
What is the best probiotic for dogs in the UK?
Purina FortiFlora (E. faecium SF68) is the best-documented pure probiotic sold in the UK. For everyday gut support without live bacteria, our pick is AyurPet GoodGut+, an Ayurvedic herbal formula.
Is GoodGut+ a probiotic?
No. GoodGut+ is a blend of ten Ayurvedic herbs and spices, including Triphala, milk thistle, slippery elm, ginger and fennel. It contains no live bacteria, so it can be used alongside a probiotic if your vet recommends one.
Is FortiFlora the same as Pro-Kolin?
They use the same species and deposit number, Enterococcus faecium NCIMB 10415, under different feed additive codes (4b1705 and 4b1707). FortiFlora is a once-daily sachet; Pro-Kolin Advanced is a short-course paste with clays and fibre.
How long should I give my dog a probiotic?
For a simple upset, Protexin suggests 2 to 3 days of Pro-Kolin Advanced, and Purina suggests continuing FortiFlora until a week after stools are normal. Longer use should be agreed with your vet.
Can I give my dog human probiotics?
It is better not to. Human products use strains and amounts not authorised for dogs and may contain sweeteners such as xylitol, which is toxic to dogs. Choose a dog product with a named strain.
Gut trouble that lasts more than a couple of days, or comes with blood, vomiting or tiredness, needs a vet, not a supplement.
How we researched this: Written by the AyurPet research team from 9 sources listed below, including peer-reviewed studies, feed additive law and each brand's UK product information, checked on 21 October 2026. Last reviewed October 2026.
References
- Commission Implementing Regulation (EU) 2015/1053 concerning the authorisation of a preparation of Enterococcus faecium NCIMB 10415 as a feed additive (gut flora stabiliser) for, among others, cats and dogs. Official Journal of the European Union, 2015. eur-lex.europa.eu
- Jensen AP, Bjørnvad CR. Clinical effect of probiotics in prevention or treatment of gastrointestinal disease in dogs: a systematic review. Journal of Veterinary Internal Medicine 33(5):1849-1864, 2019. doi.org/10.1111/jvim.15554
- Shmalberg J, Montalbano C, Morelli G, Buckley GJ. A randomized double blinded placebo-controlled clinical trial of a probiotic or metronidazole for acute canine diarrhea. Frontiers in Veterinary Science 6:163, 2019. frontiersin.org
- Weese JS, Martin H. Assessment of commercial probiotic bacterial contents and label accuracy. Canadian Veterinary Journal, 2011. PMC3003573
- Canine FortiFlora: product guide pages. Purina Veterinary Centre UK, accessed October 2026. vetcentre.purina.co.uk
- Pro-Kolin Advanced for Dogs, product page. Protexin, accessed October 2026. protexin.com
- Synbiotic D-C, product page. Protexin, accessed October 2026. protexin.com
- Paws off xylitol; it's dangerous for dogs. US Food and Drug Administration. fda.gov
- YuMOVE Digestive Care Pre & Probiotic for Dogs, product page. Lintbells, accessed October 2026. yumove.co.uk
Most tummies settle with time, a steady bowl and a little patience. Start with tonight's dinner.