This morning, my puppy didnt eat his breakfast. Has not eaten all day. Has not eaten his dinner. For about 3 hrs, when I went to work, I put him in his cage. In case he threw up again, it wouldnt be all over.. I dont know why he threw up, it was just liquid that he threw up. I can only think I fed him too much last night. Should I be worried that he has not eaten or even drank very little today??