My new cat is aggressive to my dog. How to help them get along?

Separate them for a few days then gradually reintroduce them. First with a door between them so they can hear and smell one another then separated so they can see but not reach one another and finally a supervised physical introduction. Use leash, collars and muzzles if necessary. Pheromone products such as the Adaptil collar or DAP plug in diffuser may decrease any anxiety or aggression. Provide adequate numbers of bowls, beds and toys to prevent food aggression or resource protection.

WIth some patience and training, they may be able to get along. Consider a pheromone product, such as the Adaptil Collar or DAP plug in diffusers, to decrease any anxiety or aggression in the home. If you have cats, use Feliway Spray or plug in diffusers. You didn't specify the species in the post. Keep them separate, then gradually introduce (or re-introduce) them. First, allow them to hear and smell one another through a closed door. As they progress, you can allow them to see one another but without physical contact. Correct any aggressive or negative behavior immediately. The next step would be to place one of them in a closed carrier and leave them in the same room. Do this for ever increasing periods of time until they are acclimated. Finally, allow short, supervised playtime. Be consistent and praise/reward good behavior. Separate them if they get "rowdy" until they settle down, then reintroduce them.

Introduce them to one another gradually. First, by allowing them to hear and smell one another through a closed door, then by sight without physical contact, then supervised contact. You will need to progress gradually through each phase. Correct any aggressive behavior immediately and praise good behavior consistently. A pheromone product, such as the Adaptil collar or DAP plug in diffuser, may decrease any anxiety or aggression.

Cat-dog introduction can definitely be tricky particularly when the kitty is somewhat shy or aloof. Cats are usually pretty picky in terms of who they choose to like and dislike at first, so I would not be surprised if you see some swatting and hissing in the very beginning. The best thing you can do to up your odds of a pleasant coexistence if a very slow introduction under supervised settings. I would first have your dog and cat completely separate, but in adjacent rooms so they can hear and smell each other through the door. Once this has happened for a day or two, you can place the dog in a crate and allow the cat to mosy into the dog's area. This will allow you to gauge the dog's reaction as well as the cat's in a safe way. Any positive interaction between the two should be rewarded (both the cat and dog). Once you feel comfortable, you can begin to let the dog out but only on a leash. You need to be convinced that the dog is not going to try to harm Shadow in any way. The dog should be rewarded for any good behavior (in this case, even leaving Shadow alone or ignoring completely should be considered good). If Shadow tries to approach this is fine as long as you have a solid hold on your dog. If this goes well after several supervised sessions, you can try off-the-leash supervision. Keep at this, for a while until you feel completely comfortable that they aren't going to try and kill each other! Hopefully they can have a peaceful coexistence or even be friends if your lucky!

The key is with slow introductions. Adding in barriers or baby gates that your cat can get over but your dog can't can also make it easier for your cat to get away if they need. It is also a good idea to make sure your cat has access to their own access to food, water, litterboxes, and bedding/hiding places without your dog being able to harass them. Adding in a pheromone diffuser such as Comfort Zone in shared spaces can also help with stress. You also only want to let them interact when you are home to supervise as even the best behaved dog can still accidentally injure a smaller cat. Otherwise, giving them time to observe and interact, and separating them if they become too stressed can help during the adjustment period.

Give him some time to acclimate. A pheromone product, such as the Adaptil collar or DAP plug in diffuser, may decrease any anxiety. Consider short visits to a dog park or short walks to get him further acclimated. Praise and reward him as he progresses, but correct any negative behavior immediately. If you need help, consider an obedience or socialization program. The local Petco may offer one or both.

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/