I have a Pitbull that is about a year in a 1/2 old, for the last 2 days he has not been eating. He will not eat food or treats. We have been buying him the same food for the past 4 months or so, so I don't think it is just because of new food. He also is not as active as he usually is, he has been laying on the porch all day. (He stays outside during the day and comes in at night.) Any suggestions on what could be wrong or what to do?

.What does your vet say?