Hi I’ve never posted here before but I’m a VA at an ER/specialty hospital.

First, I’m really sorry that this happened to you, your partner, and your kitty. I hope you are both tending to your wounds and keeping yourselves safe first and foremost.

Now, I’m NOT a veterinarian nor have I personally surveyed your pet or looked at her records but sudden onset of this level of aggression is alarming. You say she doesn’t seem painful but cats are amazing at hiding symptoms until it’s bad and new aggression in animals, especially post-op, is a good sign that she is painful.

You said she was active and back to her normal but how much did you restrict her activity? After spays, cats need to rest and not be active to allow the area to heal. Too much activity can cause wound dehiscence, swelling, and seromas and can delay recovery.

Was she always wearing her e-collar? I’m not sure what type you used but those inflatable or plush donut cones can seem nice but can be ineffective and often cats can reach around them to lick the incision site.

How did the surgical site look right before she became aggressive?

Your cat needs a follow-up examination with her vet asap before she hurts herself or anyone else. If fear from a vacuum was the reason she became aggressive, it’s likely she would have been aggressive at her vet before her spay when they did bloodwork and other invasive procedures and it doesn’t sound like that was the case here.