Since there isn't any redness or swelling, I don't think it's something super serious. Def. want to call your vet about it however it can just be drainage or a reaction to the sutures, it happens often after spays (same sort of incision just not as big) but because there isn't inflammation (is it hot to touch?) I wouldn't be think it too serious.
(I went to vet tech school and we had routine spays like every day and it was pretty common to see lumps beside the incision site) I know his surgery was exploratory surgery but it looks like a similar reaction |