Why is my cat suddenly aggressive to dogs because of an outside cat?

I agree! What you may be seeing is redirected aggression. The angry cat couldn't get to the source of its anger (the outside animal), so it projected it onto the other cat. 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!

That is very unusual and sounds scary! There could be a few reasons for this behavior. Sometimes there could be pain or a medical condition causing a change in behavior. Since Oscar can't talk and tell you what is happening, I recommend to have him examined by the veterinarian to be safe. Sometimes this behavior is related to the stress of seeing another cat outside. For some cats, this causes frustration and they can then exhibit bullying type behavior to other pets or people within the house. If the veterinarian thinks this is behavioral, there are a few things you can do. Try enriching the environment. 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 (really get him moving) and/or switch the food to Royal Canin Calm. If he is the only cat in the household, you may try feeding him out of a food puzzle. Hide food for him to find. Do not use these last two mentioned options if you have other cats. Provide a stand or resting place by a window so he can look outside. You may also try clicker training him for positive behavior. Here is a link about training cats: https://www.petcoach.co/article/can-i-train-my-cat/ Wash all windows and doorway exteriors where a cat may be spraying outside. Try to drive out the cat if possible. You may also need to block the window where you think Oscar may be viewing the cat most frequently. Most cats response best to combination therapy. The veterinarian can also prescribe medications which can help with aggression/stress. I hope this helps and please feel free to post any additional questions.

It sounds like Molly may be reacting to your other cat even though it is not in the room. This can be scary since it is usually uninhibited aggression. You have to do what is necessary to stay safe (spraying with water or covering her with a towel) but keep in mind that punishment can make the situation worse by causing fear. If you don't already have pheromone diffusers like Feliway in the house I would definitely recommend getting some, and I think it sounds like you need a second litter box for awhile. You may want to consider talking to a behaviorist to try to determine how your cats can live together - your veterinarian should be able to give you some names. Here is some information about aggression in cats: https://www.aspca.org/pet-care/cat-care/common-cat-behavior-issues/aggression-cats

I hate to hear that. This situation can very very stressful and it's hard to know why this is happening. It's possible Kyo is sick and his odor has changed. It may be worthwhile to have him examined by the veterinarian to make sure everything is ok. It's also possible the cats are seeing or smelling another cats outside and this is causing stress and bullying behavior. Wipe down doorways and windows to eliminate odors. Here are a couple articles to help with cat aggression and stress: https://www.petcoach.co/article/5-tips-to-handle-an-aggressive-cat/ https://www.petcoach.co/article/causes-of-stress-in-cats/ You can help relieve stress by setting aside 30 minutes a day for vigorous play for each aggressive cat, provide climbing opportunities with cat shelves and cats treats, use a pheromone diffuser and provide separate litterbox and feeding stations. Lastly, your veterinarian can provide medications or a special diet called Calm which may help the cats. Best of luck and please feel free to post any additional questions.

It may be due to illness or injury. It can also be redirected (or displaced) aggression. This is when one cat is unable to directly respond to a perceived threat and "vents" on whoever is closest. This is usually an owner or another pet. Never handle or grab your cat if she is displaying aggressive tendencies. This can lead to a serious bite or scratch. Schedule an exam with your vet to rule out medical causes. If they are indoor cats, provide a ' cool down' period by separating them. Keep stray or strange cats away from windows or doors and out of your yard. Control what your cat sees by closing doors or drawing the blinds. Consider using pheromone products to decrease anxiety/stress level in the house. Search www.pet360.com for pheromone products.

It could be stress! I would recommend taking him to a vet to rule out any health issues, especially if the hair loss is enough to cause any balding on him. As for stress inside the house, adding in a pheromone diffuser such as Comfort Zone can help with inter-cat stress. Making sure everyone has access to their own food, water, litter, hiding spots, etc can also help decrease stress. If Dexter likes to go outside, but you are concerned about him being out there, I would also look into a catio. This is a patio that is completely screened in that usually attaches to a window or door and allows your cat to be outside/observe without wandering around and getting injured. It may be just the little nook he needs to relax!

It may be a hormonal problem so the first thing you should do is have him neutered. Your cat may also be redirected his aggression on to you. Redirected aggression occurs when a cat experiences something that is over-stimulating or highly arousing or something that causes fear and the cat redirects their frustration, aggression onto whoever is closest. Sometimes it can be another cat or animal outside that is causing the problem. You could also try a Feliway diffuser/spray and/or Soliquin chews and see if that helps.