The fermentation process makes kefir virtually lactose free, so it should be safe for dogs even if the dog is lacose intolerant.
If you are going to give it to your dog, I would suggest making it yourself, because the kefir found in grocery stores is loaded with sugar. I’ve found the grains from Fusion Teas in Texas to be quite good. They are organic, healthy looking grains. You can buy them on Amazon. Stay away from dehydrated grains. They are a complete pain because they’ll waste tons of milk trying to get them up to par and they’ll never look quite as good as Fusions’ grains.
I’ve been giving it to my dogs for about a year now. My Rat Terrier had been on prednisone for years for environmental allergies, and I was finally able to take her off it, because it cleared up almost all of them (but not ragweed). I also found it improved her arthritis symptoms and her GI issues (had problems with frequent diarrhea). She ate it readily. The only reason I do not still give it to her was due to recently euthanizing her for a bladder tumor; she was 16-years old. Tends to happen to terriers more often than not in their later years.
I still give it to two of my other dogs. One eats it readily, but I have to coax the other one to eat it. I find that putting a little cheese in it is a great incentive. Get one that sticks to the plate and then put a little kefir on top of it. It forces mine to lick ferociously in order to dislodge the cheese, so the kefir gets eaten in the process.
I will give you this warning: Be careful about giving it to dogs on an immuno-suppressant (e.g. prednisone). It can cause the bacteria to run wild in their system. I gradually weaned mine off of hers, giving her the prednisone every other day and a teaspoon of kefir on the off days. If her bowels got too loose and began to get an ammonia smell (the smell is an indicator of too much), I’d cut it back or didn’t give it too her for a few days. Once I got her off the prednisone, I found it was no longer a problem.
