Question from Diane: I have a 7-year-old neutered male cat who sometimes fights with his brother and only one of his sisters (he has two). He will jump on them and bunny-kick them very aggressively and they are obviously in pain when he does this – as the screaming and flying fur attests. It’s like [...]

When a new cat is introduced to an established cat, the original cat may find the newcomer a bit intrusive. If the introduction does not go smoothly, the older cat may become resentful of the new cat for interloping into its territory. It is better to intervene before the friction between them escalates into aggression. [...]