I've used Proviable for Ellie for a very short time. I don't think it did a darn thing, but then I don't think it hurt her either.
It's probably not wrong to try them for a dog with intestinal issues, but there are varied opinions about whether they work or not. I know one study done on dogs with tummy bugs did show that it took one day off of the diarrhea. For a dog with a severe and chronic IBD issue, I'd be very surprised if these helped much.
Just like with any drug or supplement, probiotics do have side effects. They seem to be limited to GI issues. This, in some dogs, can possibly be related the GI environment changing. Nevertheless, for dogs that are already sick, if this makes it worse there can be problems. So always ask the vet first.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |