He got the URI at 12 wks while still at the breeders. He came to me at 16 wks. His appetite has remained good, he has gained 4 # , he has normal bowel movements, drinks well, hasn't run a temp, he sneezes alot, he's congested, has nasal discharge & a tiny bit from the eyes, more like "sleep". He's been on the same food at the cattery & with me. No changes. The 2nd day I had him he checked out healthy at the vet except for URI. Started L-Lysine 500mg 2 x day. 1 week later got a green nasal discharge & started 11 days Clavamox. 4-5 days after that he had green stuff again. Started 13 days Clavamox & antihistamine 1 mg 1 x day & nasal drops 2 x day. 4-5 days later green stuff again. Cultured for pasturella multicido. Started 9 days Cefa-Drops. Off cefadroxil for 10 days now. In the past 12 days he has vomited 5 times. 1st time after AM meal. Next 4 times after PM meal. Last 3 times was last 3 nights in a row. Doesn't vomit his AM meal. Appetite is strong. He vomits entire meal. Help!!