My new cat doesn't like my other pets?

You need to be very patient and do it little by little so that they get used to each other. Stroke them all in turn so they get used to the smell of each other, and if they have blankets then swap them round. Cats are very territorial animals and like to have their own space, whereas dogs will do whatever the cat tells them to! Try speaking with your vet; there is something here called Feliway which is supposed to replace the smell of stress hormones and which does seem to help a bit. I've got two, who are roughly the same age, Oliver who we've had for three years and who adopted us, and Tilly who we got at the end of January when our other cat died who we'd had for years. Tilly and Oliver are just beginning to get along now - they can be in the same room as each other and there's even the occasional kiss on the nose so I'm optimistic. Another thing you may try is sharing treats such as ham or chicken with the three of them once they're beginning to settle a bit as that often causes them to forget swearing at each other for a while. Good luck!