How to stop my male cat's aggression towards a new stray cat?

It's possible Sunny is either stressed or frustrated. Cats will lash out in either of these conditions. This link may help: https://www.petcoach.co/article/how-to-introduce-a-dog-to-a-cat/ At home, there are a few things you can do which may also help. Here is a great article about cat's instinctual needs: https://www.petcoach.co/article/why-every-cat-needs-a-place-to-climb/ Use a Feliway diffuser, set aside 30 minutes a day for vigorous play and/or switch the food to Royal Canin Calm. Most cats response best to combination therapy. The veterinarian can also prescribe medications which can help if needed. I hope this helps and please feel free to post any additional questions.

Moving can be very stressful on any species. Cats will sometimes display signs of mis-directed aggression when they are stressed. I would recommend getting Feliway pheromones started asap. These come as plug in diffusers or even collars if the cats will tolerate them. They release calming hormones into the air that people won't smell, but do help relax agitate pets. Give the cats a safe place to retreat to - a room or hideout where they can get away from each other, the dog and people. If possible try to have items from their last home there (a bed or toys). Try to feed the same food, switching it over gradually. I would recommend having several litter boxes in different areas of the house while they are acclimating. If the fights are serious enough you may need to separate the cats into separate areas of the house and gradually reintroduce them to each other. If the behaviours continue or worsen, I would recommend consulting with their veterinarian. There are medications that can help in conjunction with training to decrease behavior problems. The following website has some great information about cat behavior by one of best behavior veterinarians there ever was. You may want to search for articles on aggression and anxiety in cats for some more ideas. https://drsophiayin.com/resources/cat_behavior/

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. Unfortunately introducing another cat to another cat's environment can cause undo stress for one or both. Typically this is territorial behavior and I suspect this is what the case is with your two cats. Unfortunately this can be quite difficult to manage and address. I typically recommend starting out by trying products such as Feliway, which is a pheremone product that is supposed to keep cats calm. This product does not work in every single cat and the response varies. Anti-anxiety medications might be something to consider, but you will need to speak with your veterinarian in regards to this as you will need a prescription. If you are unable to get the two cats to be friendly towards one another and it always ends in trauma, I would seriously consider rehoming one of the cats to prevent further injury. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns and I would be more than happy to help you further.

The make feliway sprays and diffusers you can plug and spray on things to help that she will not be able to get to. If he is smart enough to walk away and not fight then I think they will be fine to figure it out on their own.

I would try a Feliway spray, diffuser or collar. It is a pheromone that helps with relaxation and anxiety. There are also supplements for anxiety. Set up separate areas for feeding and two litter boxes so they each have their own space with an area that they both have access to. Usually over time they will adjust if left alone. If she’s still aggressive there are prescription medications to give her for a little while to help her adjust so please discuss this with your veterinarian. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Kaji.

Hi there and thanks for using Petco Pet Education Center, formerly Petcoach! Congratulations on your new kitty! In these situations it is best to do introductions very slowly. Some suggestions I have for you are as follows: 1) Use a Feliway diffuser to reduce overall tension in household 2) Go back to the beginning and over the first week introduce by smell only (introducing cats to each others bedding or something that has their scent on it) 3) Then introduce by sight only but no direct interaction. Do this for a week 4) Finally introduce cats together but only with direct supervision and with plenty of escape routes for both cats. Only leave them together for a very short time at first 5) Have plenty of tall cat towers and other things for the cats so they can observe each other from a distance 6) Have at least 3 litter boxes in different locations and definitely continue to feed separately and have separate water bowls. I hope this is helpful! Good luck to you and Malish!

I would recommend getting a few Feliway Multicat diffusers before bringing the new cat home to try to calm tensions that may arise https://www.feliway.com/us/Products/FELIWAY-MultiCat-Diffuser . I would also recommend reading this article on how to deal with cats that do not get along by Dr. Sophia Yin, which may provide you with a plan on how to deal with conflicts: https://drsophiayin.com/blog/entry/feuding_felines/