Cats are very territorial animals. Cats compete for space, and
then try to protect it after they have it. Cats will usually
hiss or growl when they are displaying territorial behavior.
Sometimes, the territorial behavior is more difficult to detect.
For instance, sometimes cats will use body language or other
forms of communication to display aggression towards other cats.
Some cats are very territorial with the litter, and may even
prevent other cats from using it. This is more common in multi-
cat households. One solution is to ensure that you have enough
litter boxes for your cats. Some veterinarians recommend one
litter box for each cat. However, your cats will most likely
share the litter boxes instead of sticking to their own. Most
cats are territorial of their living space, especially with cats
that do not live in the household. Watch what happened the day
that the neighbour cat decided to crossover into someone else’s
balcony (both cats are very friendly and there wasn’t a fight,
just a disagreement).