My Baby Bo, who is new to the family for 4 weeks (he's 18 weeks old) has had diarreah for 2 days even though he has been perfectly fine. He was the runt and is tiny (only 4.25 lbs). I'm feeding him kitty dry food (Anthony's from Petsmart) and 9-lives shredded. Do you think it could be the 9lives? He has been eating a tiny bit for the last 4 weeks ... if not better by tomorrow, he's off to the vet, but I'm looking for a few suggestions ... thanks