I don't think he is dehydrated. He drinks water like a fiend, and when I do the scruff of the neck test, his skin snaps right back, there is no tenting. I have noticed in the past couple weeks that he is eating less, and I asked the vet if he looked too thin, but the vet said everything looked fine. He only threw up once on Sunday (watery and yellow), but he threw up multiple times initially with his uri. He is still on antibiotics for that (amoxi), but the only thing that has changed in his routine is his boosters.