I have never had a problem with my dogs after getting neutered or spayed, they were pretty much normal within 24hrs. They never had to wear the cone of shame, never had to have pain meds, but always had an antibiotic as a precaution. I'm EXTREMELY surprised they did surgery knowing he had an existing infection, IME most vets would wait until that was cleared up 1st. Prime example, when i got Anna from a resue, her vet wouldn't spay her until ALL her other medical issues were cured even though she was old enough. Personally I don't like Banfield, I used them once years ago & never have since, plus I've never heard anything good from others that have used them.