My cat has a fluid lump at the amputation incision. Is it a seroma?

Since the same lesion repeatedly fills with fluid, I would suspect a cyst of some sort. While this is not an emergent condition, your cat should be examined by a vet within the next week. Your vet will be able to draw a sample of fluid and cells from the lesion that can be evaluated microscopically, as this will help to determine the underlying cause. Until that time, do not express additional fluid because this can open the lesion up to infection.

Good question! Given that Lucky seems ok and is hungry with a good temperament, it's fine to wait until Monday. I would gently clean the area with warm water and antiseptic soap, and put an Ecollar on him to keep him from licking at it. You can make one at home, and I will put a link below on how to do that. Keep an eye on the area, and if the discharge increases, he becomes lethargic, and/or his appetite drops, then yes take him into an ER vet. If you would feel better having him seen now instead of waiting, then certainly take him in to the ER clinic now. I'm always an advocate for going with your gut, and having the animal seen sooner rather than later to be safe. Best of luck! https://www.youtube.com/watch?v=8ffR-LzyW1M

This could be a bruise (hematoma) or a developing abscess. Your kitty could have gotten into a fight with another cat. I would observe it. It it starts hurting your cat or is fluctuating, or if your kitty is getting lethargic or stops eating he needs to be seen by a veterinarian for an exam.

Hi there. This mass is somewhat unusual-looking from what I can see in the photo, so there's no way to know what it is without being able to take a biopsy, or remove it and send it to the lab for testing. So yes, I do recommend taking him to the vet to have this checked in person and see how your veterinarian suggests proceeding from there. If your kitty is acting normal, I would not consider this to be an emergency, so it should be fine to wait and take him tomorrow. Many veterinary clinics have implemented no-contact protocols during this time (curbside service, etc.) to minimize the risk of COVID transmission, so I would encourage you to ask your veterinarian about their current protocols for this if you're concerned.

It looks like it may be healing. If it isn't big, full of pus, painful to him, he's eating, and isn't lethargic, you can wait until Monday to have him seen. Otherwise, take him into a vet immediately.

If the area is leaking a clear/light pinkish fluid, that makes me thing she has a seroma. A seroma is a collection of fluid, usually occurring at an incision site. This is not a medical emergency, so I would wait to take Lily into the vet until Monday. Keep her quiet and rested until then, no running, jumping, or playing. Take her out to toilet on a lead only, and bring her right back in when done. I would keep an eye on the swelling, and if pus starts coming out, or it becomes red, swollen, or warm to the touch, then I would bring her into a vet right away.

This could be a cyst on Lucious. I would take him into the vet tomorrow if they are open for normal business hours for an exam. Otherwise, I would take him in on Monday. If it is a cyst, it will be need to be drained sterilely, or may need to be removed to prevent recurrence. Don't try to open it or drain it yourself, you will introduce infection into the area.