I'll try to make this short. I adopted a 2yr old Min Pin about 3 months ago. He came to us extremely overweight and was eating Purina Little Bites. We switched him to Purina Beneful and found out he is allergic to it. So we switched him to Purina One Sensitive Systems. He gobbled that right up from the get go and then all of a sudden he won't eat it. He puts his nose in the air as if to say "I'm not eating THAT"! We let him skip three feedings before we starting really freaking out and checked his teeth to make sure no problems there and found nothing wrong with him. We offered a doggie treat to see if he was sick, but he danced all around and gobbled that up like it was gold. We even bought wet food to mix with the dry food and he turned his nose in the air about that one too. We even chopped up his doggie treat and put it in a bowl and he wouldn't eat it that way. Why is he doing this?? It's almost like a game. Any thoughts???? Should we just let him starve until he gets hungry enough to eat again?? He does still drink water, gets 5 walks a day and is peeing and pooping just fine. HELP!