My cat got a lion cut. Why is the other cat hissing and growling?

Yes this is normal. Your cat has different scents now from being at the vet and it can be scary and overwhelming for the other cat, especially with an e collar on! Usually it only take a day or two and they adjust and go back to their normal selves. Your may take until the cone comes off since it can scare them

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Draco. This can happen. He smells differently, and the other cat sees him as a stranger. Keep them separated for the next 48 hours, then slowly introduce them again. Low meowing and hissing is fine, I would not get worried about that. I would only be worried if there was aggression. I hope this helps!

Oh no, that's not good! I would separate the cats, and slowly reintroduce them to each other. Take the cat who is aggressive, and put her in her own room with her own food, water, and litter box. Keep the door closed, and for a few days, feed them both treats on other side of door so they associate each other's smell with a good experience. Then let the other cat in the aggressive cat's room while the aggressive cat is in a cat carrier. They can smell each other, but not be in contact. If either becomes upset or show signs of aggression, remove the second cat from the room, and try again later. Praise them when they interact appropriately. When they are interacting well with each other through the carrier, you can let the aggressive cat out of her room, and see how she interacts with the other cat. Praise them when they interact appropriately, and separate them with any sign of aggression or upset. I would get a cat tree with lots of shelves to give the cats vertical space to get away from each other. I would keep the cat in her room when you go out until they are comfortable with each other. I hope this helps!

Cats will often do this if they have been separated for a period of time, especially if one cat looks or smells different - your female cat may have strange smells on her from her time outside. Most of the time, this reaction is mild and the cats will get along again after a day or two. If there is any serious fighting or if his aggressive behavior towards her does not seem to be improving, then you may need to separate them and gradually reintroduce them to each other - feel free to ask for additional help on this if needed :)

Great question! Washing Rikku and Lucy will have changed their smell, and they now see each other as strangers. I would separate the cats, and slowly reintroduce them to each other. Take Lucy, and put her in her own room with her own food, water, and litter box. Keep the door closed, and for a few days, feed them both treats on other side of door so they associate each other's smell with a good experience. Then let Rikku into Lucy's room while she is in a cat carrier. They can smell each other, but not be in contact. If either becomes upset or show signs of aggression, remove him from the room, and try again later. Praise them when they interact appropriately. When they are interacting well with each other through the carrier, you can let her out of her room, and see how she interacts with him. Praise them when they interact appropriately, and separate them with any sign of aggression or upset. I would get a cat tree with lots of shelves to give the cats vertical space to get away from each other. I would keep Lucy in her room when you go out until they are comfortable with each other. I hope this helps, good luck!

Bathing all three cats may help but may not do much since it has been 9 days. Using Feliway wipes or sprays may help. And removing the cats from each other as you have been is the absolute right thing to do. Here’s an article with some other suggestions http://www.vetstreet.com/care/nonrecognition-aggression-in-cats Good luck. Thanks for using PetCoach.

There does seem to be an unusual phenomenon that when one animal attends the vet for a time its companion can react badly on its return. Possibly due to unfamiliar smells. Usually it settles after a week or so. If not you could try bathing the cat or invest in a pheromone diffuser to try and settle them.