I am having this issue with my eight month old female--stopped eating all her favorites including chicken breast. Will only eat ground beef and broth. Was on Taste of the Wild pacific salmon when she came from the breeder and we transitioned her to Fromm's large breed puppy. In am gave her Spots Farm human grade chicken mixed with broth with her grain, evening real chicken with grain. No problem. A month ago, she started to whine and cry, and backed off from eating. We have tried canned food-Victor, Fromm, Science Diet. Vet x-rayed and said all related to her going into heat. Never heard of this. Thoughts?