How to choose the best probiotic for your dog (UK)
Updated 7 November 2026. 4 minute read.
Short answer: A good dog probiotic lists its strains and the number of live cultures (CFU) per daily portion. It ideally includes a prebiotic fibre such as inulin, and comes in a form your dog will happily take every day. Compare price per day, not price per pack.
1. Named strains, and more than one
Look for the strains printed on the pack, such as Lactobacillus acidophilus, L. plantarum, L. rhamnosus or Bifidobacterium animalis. Products that just say 'probiotic blend' without naming anything are harder to judge.
2. A stated CFU per daily portion
CFU means colony-forming units: roughly, how many live bacteria are in each daily portion. Products quoting their CFU (often in the billions) are being clear with you. A higher number isn't automatically better, but a missing number is a red flag.
3. Prebiotic fibre
Prebiotics are fibres that feed the good bacteria. Inulin (from chicory) and psyllium husk are common, and psyllium also helps to firm up loose stools.
4. A format your dog will take
Pastes act quickly for short upsets. Powders mix into food. Chewable flavoured tablets are easiest for daily use over weeks. Whatever you choose, it only works if your dog actually eats it.
5. Price per day
Divide the pack price by the number of days it lasts at your dog's daily amount. A cheap pack that only lasts two weeks can cost more than a dearer one that lasts two months.
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Common questions
Do dogs need a probiotic every day?
Not usually. Many owners use one for a few weeks around a food change, kennels, travel or antibiotics. Some dogs with sensitive stomachs do well on one long term. Ask your vet.
Can puppies have probiotics?
Many products are suitable for puppies, but check the pack, and see a vet promptly if a puppy has diarrhoea.
Can I give my dog a human probiotic?
It's better to use one made for dogs. Strains and amounts differ, and human products can contain ingredients that aren't safe for dogs.
Are dog probiotics safe?
They're considered very safe. The PDSA says side effects are extremely unlikely.
This page is general advice, not a diagnosis. If you're worried about your dog, speak to your vet.
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