Shadow is 9 weeks old. Very active and worries (pesters) the other 2. He was on Diamond food for puppies when I got him. I started adding Blue Buffalo for puppies to change him over. His poop was soft to begin with. I carries him to the vet Tuesday and he said he had round worms. He had a dose of Strongid Tuesday and today and I have mixed Forbid in his food the 1/2 bag, yesterday and today. Well his poop is real runny now. It is brown. Could all this be from his new home and the medicine? We go back for another shot the 10th. He was the runt and weighted 3.4 lbs. He was a kennel pup.