PetLab Co. Probiotics for Dogs, Clinically Tested Support for Gut Health, Diarrhea, Digestive Health & Seasonal Allergies - Salmon Flavor

Yes its expensive but it really works. I saw an ad for this while I was playing a game on my phone. I decided to give it a try. It worked. Both of my dogs are happier and more comfortable. They quit chewing on themselves. The head shaking stopped and so did the constant scratching. It took about a week to totally take effect but it was worth it. My Border Collie is much happier. My Pit Bull's fur has grown back in. Its great stuff. I highly recommend this product. PetLabCo Pro-Biotics really work.