I've got two cats - a four year old, and a 9 month old kitten. Both neutered, both female. When I first got the kitten she was 3 months old and chased the older cat around the house a lot as she was trying to play. I kept them separated at night for the first couple of months because of that. Its been relatively ok since, except over the last two months when its been getting more fighty, and the older cat is now being more assertive. What happens is that Kitten approaches Cat. They both sniff each others noses, and then Cat pins down Kitten a few times, they wrestle a bit, and they then do a lot of chasing around/ricochetting off furniture. None of their bites seem to be serious, and inbetween times they're happy to be in the same room. No-one is peeing where they shouldn't be, or trying to leave home, so should I assume that they're just sorting out their relationship with each other and just leave them to get on with it??