Can dogs eat it?
Can dogs drink kefir?
Last updated 23 September 2026 · How we write and check this
Short answer
Plain kefir can be offered to most healthy dogs in small amounts. Fermentation breaks down part of the lactose, so many dogs tolerate it better than milk. Choose unsweetened, unflavored kefir, start with a teaspoon or two, and treat it as an occasional extra. Flavored kefirs may contain sugar, fruit, or sweeteners that dogs should avoid.
What kefir is
Kefir is milk fermented with a mix of bacteria and yeasts, which gives it a tangy taste and a thin, drinkable texture. The microbes consume some of the lactose, so kefir usually contains less than regular milk. Plain whole-milk kefir has around 60 to 65 calories per 100 ml.
Long-fermented homemade batches can contain traces of alcohol, so shop-bought plain kefir is the more predictable choice for dogs.
Starting slowly
A teaspoon poured over food is enough to begin with for a 5 kg (11 lb) dog. A 30 kg (66 lb) dog can start with a tablespoon. Watch for loose stools or gas over the next day. If your dog tolerates it well, you can offer a similar amount a few times a week.
Keep it refrigerated and use it within the date on the pack.
Labels to check
Flavored kefirs, such as strawberry or vanilla, often contain added sugar. Some low-sugar products use sweeteners, and any product containing xylitol is dangerous for dogs. Kefir drinks blended with fruit may include grapes or raisins in rare cases.
Coconut and water kefirs are different products and not needed for dogs.
Probiotic claims
Kefir is often promoted for gut health. The microbes in kefir were not selected for dogs, and evidence for specific benefits in dogs is limited. If your dog has ongoing digestive trouble, ask your vet about a canine probiotic rather than relying on kefir.
Key takeaways
- Plain, unsweetened kefir is fine in small amounts for most dogs.
- Fermentation reduces but does not remove lactose.
- Avoid flavored or sweetened kefir and anything with xylitol.
- Talk to your vet about ongoing gut issues rather than self-treating.