I have a cat that's fifteen months old. He has been the only pet since I got him at the age of 6 weeks. My mother passed away in Dec and I brought home her cat that's about 9 years old in Jan. My cat is a bully. He licks the new cat on top of the head for awhile then kind of stradles him and bites him on the back but doesn't draw blood. I thought he would stop after awhile, but after almost 6 months he still does this! He doesn't do it as often,but it still happens. Especially in the morning. I think that's a bit odd. At other times, they will lay nicely together. I don't know if it's a dominance thing or if he's just trying to play. I hope he will outgrow it. I've trained him in everything else with a squirt bottle, but with this it's only been moderatly effective. Is this ever going to completely stop? They are both neutered males.
If your cat was 9 months old when your Mom's cat came to live with you, I would think it's probably an attempt to get him to play. Kittens wrestle and bite in play with their littermates and being an only kitty for a while, your boy had nobody to do it with. If he's not hurting the other guy and they do have times when they lay together peacefully, I wouldn't be too worried. It does sound like he's outgrowing it if it's happening less often. I have 3 females; 8 months; 12 months and 14 months. There are constantly tufts of hair all over my upstairs hallway from them wrestling. They love each other and they are not fighting. But you see one of them get a crazy look in her eyes and suddenly there's a herd of elephants running up and down the hallway, into the tub, across the bed, BANG into the hallway and then the fur explodes. They are just having fun and hopefully that's all your boy is trying to do. How does the other cat react? PS. I'm sorry about your Mom and I think it's wonderful that you took her cat in instead of turning him into the streets or leaving him at a shelter like a lot of people do.
Even neutered males will take part in a feline hierarchy. Sounds like the adolescent male is saying "this is my house" to the newcomer. Right now your kitty has about the same mentality as a teenage boy. He's trying to be a "big man". He'll probably grow out of it and adjust better as he gets use to the new guy. I wouldn't say he's is initiating play because the stradling and biting maneuver is a text-book dominance pose. He is basically "mounting" the other cat to establish his dominance.
I like most cats better than I like most people. I'll try to be nicer if you try to be smarter.
I've been having the same problem! Our female (spayed) is 14. It's been a little over a year since my son brought home a male about 9 months old. He torments her terribly. We had him neutered but for about 3 months after he still was trying to mount her. But this stops. She wanted nothing to do with him and hisses and growls at him. It's taken about a year for them to come to terms. He just wants to play because he's a kitten and she's to old to bother. She is more tolerant of him now, sometimes will let him get close. I even saw them together on a chair sleeping. I praise them both when they are nice together, which is still infrequent, and give them both special treats. The year before we brought home a puppy she had to get used to too and it took a year for her to get over him, then the kitten! Poor old girl, no wonder she's grouchy!
That's going on with me too! My my 4 month old kitten Oreo keeps biting and tackling my other 12 year old cat Tiger Tom. Its not a playful tackle and Oreo has arrived this year and Tiger arrived well... 12 years ago. Oreo was just lying next to tiger like an angel but then ATTACK!