Per the bottle this only treats round worms. If you pet had worms other than round worms then you treated them for the wrong things. Anytime you worm an animal they will have diarrhea. Learn to read the lable.
I bought this at a local pet supply shop after realizing my 11 mo. Old dog had worms. It was the weekend, so wanted to ease his discomfort until I could get him to vet. ALSO, gave to 4 mo. Old kitten to protect him. BOTH ENDED UP WITH EXPLOSIVE DIAHERREAH! Then vet informed this product WON'T RID PETS OF WORMS BUT WILL BE A GUT CLEANSER A.K.A. COLON CLEANSER. Gave one star because pets were ok with taste. Seriously, recommend an experienced and inteligent vet instead!