Sorry for the rushed response earlier!
I had a kitty sitting insulin job to dash off to. I'd give him three droppers of antirobe, as he's not a small fry. Is there anyway he'll allow you to put a hot compress on the fresh rupture to help facilitate draining? It will keep the wound open, and allow all that pus to keep coming out. I don't know how well Peanut Butter takes his meds, but with antirobe I usually end up with more on me, and all over things, than in the cat!:rolleyes: It says on the bottle 1-3 mls per 5lbs body weight, depending on severity. 1x daily. Two abcesses (maybe more you don't know about yet), I'd go with three droppers full for Peanut Butter. Knock the infection out better IMO. Kissies to the boy, and glad to hear he ate some food. :)