Every Monday when my son returns to school and my husband back to work my lab refuses to eat. He really likes the new Salmon-Potato food I got him. He's been on it for over a month now. Seems whenever his routine is changed, he won't eat. I ignore and don't push him to eat. I figure he will eat when he's hungry; but he's looking for his treats too! Is this 3 year old Lab of mine playing me?