This doesn't sound good at all. Is there any way he can stay inside with you? He really needs to be monitored and I think the vet kind of screwed up on not putting him on IVs. I really hope he gets through this. He can't go on not eating and hardly drinking. I think it would help him to want to get well if he wasn't out by himself in the doghouse. I'll be praying for him. I hope he gets well very soon.