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The chances are that your cat is suddenly acting aggressive and actively defending its territory. As an owner, it is your responsibility to keep it calm. Bringing home another new cat when you already have one may involve some time until the cat tolerates each other.
More territorial than dog
A cat’s territorial behavior can manifest in multiple ways due to various reasons. It is to be noted that cats are much more territorial compared to dogs in their nature. The feline species is also more solitary. The characteristics of territorial behavior include stalking, attacking other cats, hissing or marking by urine. If you brought in a new cat, keep the new feline separate for some time. It is a good idea to switch the bedding of the two cats so that they can smell each other. They will then sniff in other places like under the doors to get to know each other.
The presence of territorial behavior in cats is much more severe than dogs as felines fiercely guard their territory. A cat regards all newcomers as intruders or invaders. The invader could be a new cat in the house or a stray cat ambling outside. Felines are also much pickier. Your cat may like one cat but dislike another. Non-neutered male cats can be specifically territorial. It is thus crucial that you neuter or spay your cats. Even a friendly and social kitten could become a territorial cat when it matures. To avoid such scenario, socialize the kitten from three to 12 weeks of age. Put it in many situations and even those which involves going out of the house. It should not hesitate to go anywhere.
Search for professional help
If your kitty suddenly becomes extremely territorial, like showing aggression towards all, do take it to the veterinarian as soon as possible. The medical professional can help out to iron any health issues. It is found that aggression masks underlying health problems. If you have not neutered or spayed your cat, do it now. Neutering or spaying goes a long way to eliminate aggression. One non-neutered or non-spayed cat can affect all pets within the house.
Whatever you do, you must not permit your kitty to fight other cats. Felines are not canines. Dogs may resist at first, but soon a truce between dogs come into play. This never happens for cats. The more cats fight, the worse the problem becomes. If you see your cat fighting with another cat, use a whistle or throw water to separate them. Do not physically get yourself between two feuding cats. You may end up getting hurt. Never punish your cat for territorial behavior. Doing this will make the cat much more aggressive. In case the problem continues, there could be a need to separate the cats. Seek professional help to solve such feline behavioral issues.