Option 1: Slow and steady desensitization
If your dog is too fixated on the cat, you can try desensitization, the goal of which is to reduce your dog’s reaction to the cat by gradually increasing her exposure to him. Put the cat in a room (e.g., a bedroom, a bathroom or a spare room) with a tall baby gate across the door. The room you choose should be one the dog cannot access and doesn’t need to access. For example, if the dog sleeps in the bedroom with you at night, don’t pick that room for the cat. The idea is to separate them and only allow them to view each other during specific times.
In his room, give the cat all needed supplies: litter box, toys, food and water. Keep in mind that cats are good at squeezing through small gaps and are also good climbers and jumpers. So, make sure your cat can’t get past the gate you put up. The gate needs to be a barrier that allows the cat and dog to see one another, but does not allow them to access each other.
To begin desensitization, let the dog view the cat briefly through the gate, and then get the dog to focus on something else, such as playing with a toy or practicing cues. Sometimes it helps to keep the dog on leash so that you can move her away from the cat when you try to refocus her attention. Praise and reward the dog for being able to focus elsewhere. Continue to give the dog short viewings of the cat throughout the day.
Sometimes, even seeing the cat at first is too exciting for the dog. If this is the case, close the door and begin feeding each animal on his or her side of the door: The cat eats his food in his room, right next to the door, and the dog eats her meal on the other side of the door. This allows each animal to associate the smells of the other with something good: food. You can also swap out the blankets and bedding of each animal, giving it to the other. That way, the dog can get used to the cat’s smell and the cat can get used to the dog’s smell, without overstimulating either of them.
Hopefully, through this process of slowly letting the dog see the cat and get accustomed to the cat’s presence, the dog will eventually become desensitized and lose interest in the cat. In some cases, the dog will lose interest in the cat within a couple of hours, but it can take days, weeks or even months. Each dog (and each cat) is an individual and will learn at his or her own pace.
With that said, though, it is possible that your dog may not ever be able to safely share space with a cat. If you don’t feel you can trust your dog around your cat, you should keep them apart. Many dogs can injure or kill a cat very quickly, and your dog can also be injured by the cat. Your first priority should be ensuring that everyone stays safe.
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How to tell if your cats get along with each other – six key behaviours to look for.
Why does my dog just stare at my cat?
If your dog has a strong prey drive (the inclination to seek out, chase and potentially capture animals seen as prey — usually smaller animals such as cats or rabbits), she might become very focused on the cat. She’ll stiffen, stare, and may start barking or whining.
Can Cats & Dogs Be Friends? | Jackson Galaxy
Have you ever felt your dog’s eyes following you, like they’re watching your every move? Maybe your dog stares at you while enjoying a chew toy or bone. Or, perhaps you enjoy sitting with your dog and gazing into each other’s eyes. Whatever the scenario, dogs spend a great deal of time staring at humans. And many dog owners spend a great deal of time wondering why.
Unfortunately, there is no simple one-stare-fits-all answer. Dogs have many reasons for turning their gaze on us. But most of the time they are either communicating with us or waiting for us to communicate with them. With a little knowledge and observation, you can learn to tell the difference. You can also teach your dog alternative ways to communicate that aren’t quite so puzzling as staring.
More than almost any other animal on earth, dogs are in tune with humans. They sense our moods, follow our pointing gestures, and read us for information about what’s going to happen next. That means they stare at us a lot to gain knowledge about their environment. Essentially, they are waiting for us to do something that will impact them. For example, dogs quickly learn that their owners pick up the leash before taking them on a walk. Therefore, they will watch for that signal that a trip outside is on its way. The same is true for mealtimes, play sessions, car rides, and so much more.
Dogs also wait for more deliberate cues from their owners. Cues to perform a specific behavior like sit or down are chances to earn a reward. Since dogs love getting a treat, toy, or game, they will keep an eye out for these opportunities. This is particularly true of dogs trained with positive reinforcement methods. These dogs learn to love training and wait eagerly for signs it’s time to play the training game.