My cats are fighting after grooming. How to stop long-term aggression?

It sounds like you have a behavioral issue in the house. One of the cats is trying to be dominate over the other. I would make sure you have 1 more litter box than cat. Also have multiple areas to place food and water. This will eliminate competition over those things. I would try feliway in the rooms the cats spend the most time. This is a pheromone to help with stress. Increase exercise as best you can. They do make toys you can hid treats an the cat has to get them out. Also hid toys around the house at night so Mo and Francis have something to do. IF that does not work it is always best to have a good exam by a vet to make sure the aggression is not due to illness or pain. thanks for using pet coach

If the aggressiveness is only occurring after a bath I'd recommend separating them after bathing for a few hours until they have calmed. You can also try using a Feliway diffuser or spray to see if this helps reduce the tension. If the aggressiveness continues or gets worse you may want to schedule a vet visit to ensure Sasha is not having any health issues contributing to the behavior change. Thanks for using Petco Pet Education Center, formerly Petcoach!

I am sorry to hear about your kitties! It is possible there is a change in dynamics if one cat has now reached sexual maturity. If he is not already neutered this may help. You can also get a Feliway multicat diffuser for your house which can help reduce intercat aggression, but it may also take some time and training to get them to get along again. You can read about methods for training the cats to get along again at https://drsophiayin.com/blog/entry/feuding_felines/

Unfortunately the new cat is likely causing stress and this is a common feeling reaction to stress. She may not want to go outside as long as that other cat is around. It may be difficult to keep the other cat out of your area unless you want to purchase or build a fence. There are fences available that have curvature to the top that make it difficult for a cat to climb over. There are some things you can do at home that can help to manage her stress. Set aside 30 minutes a day for a vigorous play. Use a pheromone diffuser. There is a special prescription food made by Royal Canin called calm which may help. Use food puzzles. Give environmental enrichment. Lastly, your veterinarian has medications which can help as well. Many cats require a combination of therapies. Best of luck.

A sudden behavioral change could indicate an issue such as pain or underlying illness, so if this happened suddenly or recently, having both cats examined for any signs of ongoing pain or illness is a good first step. if they check out healthy (aside for any known previous conditions), then adding in something such as a pheromone diffuser can help with stress between cats and aggressive behavior. Making sure both cats have access to their own food, water, litter, bedding, etc can also help decrease tension and stress over these items. If one of your cats is going blind or hard of hearing, adding in nightlights and making sure your cat can get around easily may help reduce stress related to these conditions and reduce tension between both cats.

Poor Puss. It sounds like he is very stressed. I have a couple of suggestions that you can try at home, but I suspect you may need to get your veterinarian involved and utilize some medication if Puss is that stressed. One option for decreasing stress is to add a Feliway Diffuser ( https://www.feliway.com/us#redirected ) to your house. This is a calming pheromone that will work for a month and may be beneficial for both cats. I have also had luck with Rescue Remedy ( http://www.bachflower.com/rescue-remedy-pet/ ) which can be added to the water and will be safe for both cats. What may have happened this morning is something called displaced or redirected aggression. Something that stresses Puss out can cause him to lash out at something else (like your dad). Simply the smell of your other cat may have caused that type of reaction. This type of aggression can respond well to medication, so I would recommend speaking to your veterinarian about your options. Good luck! I hope that was helpful. Thanks for using PetCoach.

Thanks for using Petco Pet Education Center, formerly Petcoach! This is possibly because she smells differently. I recommend a product called Feliway which can help decrease stress and anxiety associated with environmental changes and stressors. You may find this online or at your local pet store. It usually works great in this type of scenarios. Good luck and have a great day!