-
I agree this is potentially concerning. Cats may not eat the night of their spay, or have some altered behavior, but it typically only lasts for about 24 hours at the most. I tell all my clients that if there are any concerns lasting past 24 hours post surgery, to let us know.
The incision may be a little inflamed in the first day or two. Fluid swelling around the incision can also sometimes occur in cats but is not common. It is something that can happen if they have access to their incision and can lick or chew it, or if they are doing too much running and jumping.
The swelling isn’t necessarily an infection, it can also be sterile (non-infected) swelling called a seroma, which can resolve with some warm compresses to the incision.
As for the eating, I would be concerned about the fever spike several days after surgery. Fevers that late after surgery and any that recur are uncommon. If your cat’s appetite issues are not related directly to a fever, it is possible that she has developed some degree of food aversion due to attempts to feed her while she wasn’t feeling well.
I would hope by this time your vet would have determined if there were any complications related to the surgery itself that were still contributing to concerns. So, anything like that aside, it could be food aversion due to not feeling well at the time of the fever or potentially underlying nausea. Feeding a different food flavor or brand may be helpful if you haven’t tried that, because she may associate her previous diet with the times she didn’t feel well.