My six month old boxer has always been a great eater. We feed him blue buffalo wilderness for large breed puppies. The bag says he should be eating around four cups a day so we do two in the morning and two at night. Ever since my in laws got a dog (a three month old Weimaraner) pedey hasn't been eating like himself. We've been tested for parasites and have come up negative. The other puppy lives upstairs and they play once in a while outside or she will come downstairs. I don't know if he is depressed? It worries me. And many times it's inconsistent-some days he will eat all of his food slowly but surely and other days he will barely eat two cups. I'm really worried. I know he likes his food and I don't know if this is stubborn boxer behavior or if something is truly wrong. Has anyone has has this happen when a new dog was introduced???