WHY ARE MY CATS FIGHTING ALL OF A SUDDEN?
Your cat's territorial protection instinct can also be triggered if stray cats are outside and your cats can see or smell them. In those cases, it might be good to close the shades when feral cats are roaming, or even set up motion-activated sprinklers to encourage feral cats to visit a different yard.
Medical Issues Are at Play
If your cats aren't fixed, then sudden fighting might be caused by puberty. If they're spayed or neutered, it could be a different medical issue. Cats tend to hide health problems, but they might become withdrawn or aggressive if they're not feeling well. If the behavior persists, it may be time to take them to the vet for a checkup.
You Can Help Them
One easy and effective solution is to set up Comfort Zone Calming Diffusers in different rooms where your cats hang out. This drug-free solution mimics a cat's pheromones and helps communicate the environment is safe and secure. You might also want to try the Comfort Zone Calming Collar, especially if your cats go outdoors.
This collar with the BreakAway safety feature helps keep the calming pheromones with your cats whether they're resting in the home or on the go.
You could also try adding cat trees, condos, and window perches around the house to give your kitties more territory to call their own. Tall spaces can also increase confidence and help cut down on fear-based fighting.
If the new behavior is intense, you may need to reintroduce your cats to each other. The process could take a few weeks. Start out by keeping them in separate rooms, and swap blankets and other items with their scents. Feed them on either side of a closed door. When they can eat calmly, try a closed gate where they can see each other. Then graduate to supervised visits with treats.
When cats that used to be good buddies suddenly start fighting, it's generally temporary. But sometimes they need a little help from you. A nudge in the right direction can help them remember why they love each other all over again.