i highly doubt this is the cause but really depends. How clean is their litter box? My cat used to do that unless his litter box was really clean. the more we keep it clean the more he uses it.
We just recently had gotten a new kitten shes about nine weeks old and shes a female. Our old cat soxx hes a male and about five years old is having trouble accepting her. Our old cat doesnt hiss or growl at
the new kitten but he has pounced on her a few times. Sometimes we'll have them both...