Ok, so I've tried the Zinc, it was only 50mg from the drug store. (The Husky mix and a Pit Bull share the same room.) When I first started the Husky on the Zinc, after a few days, someone had explosive diarrhea in their room. I don't know which one, but I suspect it was the Husky. So I stopped giving her the Zinc for a few days just in case it was her. I started giving it to her again and after a few days someone exploded in their room again, but I don't know which dog cause the diarrhea hasn't continued and they both have normal stools. Could the Zinc have caused this mess? I'm reluctant to put her back on it now.