my gsd has had water diarrhea for 3 weeks now. we went to the vet and did a stool culture, came back fine. she is eating and drinking only thing that seems to be off is she sleeps a lot. but she is still fairly active wants to play etc.she hasnt lost any weight she has actually gained 2 lbs. she was on a medication for a week for her skin and we changed her food to a different flavor of the same brand that might have caused it. i changed her back to what we normally had been feeding her diamond naturals large breed puppy lamb and rice. we had switched her for about a week to diamond naturals chicken and rice. and yes, i was stupid and forgot to transition her. we are going to start putting real chicken and rice into her food and maybe some sweet potato to hopefully get her back on track. any other suggestions?