I use Probiotic Max by Nature's Farmacy. Ann also recommended it, and their products are wonderful. I highly recommend it. I sprinkle it on top of Katie's home-cooked meals, and she likes the taste. I have given some to friends, and their dogs also like it. Here's some interesting reading about probiotics. I definitely believe they help Katie. I have also purchased the probiotic paste for times that I can't get Katie to eat and I think she needs it, but I haven't used it.
DOGZYMES® Probiotic Max – 8 Ounces » Natures Farmacy Inc. DOGZYMES Canine Probiotic Paste – 30 CC » Natures Farmacy Inc. THE FORGOTTEN ORGAN IN OUR BODIES??? DO YOU KNOW WHAT IT IS? | Natures Farmacy Inc.