Mastiffs

My lil man (Brees) just turned 9 weeks old. We have had him for a week and his stool is loose. We are feeding him Purina Puppy Chow for Large Breed Dogs. Are we doing something wrong? We have two other dogs and have never had this problem.

Please Help !!

What's probably happening is that the breeder was feeding a different kind of dog food and the abrupt change upset his little tummy. OR it could be Giardia or coccidia. You need to take him to the vet and get a stool sample just to be sure. Both of these can be cured but you don't want to wait too long.