We have 2 maine coons, one is 12 months old and the other 2 years old. Both male and un-neutured. They are house cats, so never go outside. We've never had a problem with them. They have their little play fights, but nothing too serious but just as often, you'll find them cuddled up together or grooming each other.
Recently, a cat from the estate across the road from us has been coming up to our house, sitting on the window ledge and making noises through the window. Like cat fighting noises or deep growls. Our cats will then jump on the inside window ledge and they'll start jumping up at the window. When this happens, we often go outside and shoo the other cat away, but they've been coming over to ours more frequently, sometimes just sitting on the window ledge looking through the window if our cats aren't around, eg if they're sleeping upstairs.
Our eldest cat has started urinating in the house. We think he's trying to mark his territory. My other half has decided to book both cats in to get neutered, to stop the spraying around the house. It's not hygienic and we have a baby on the way. I wondered if there was a way to stop this other cat coming over at all in the meantime as it must be stressful for our cats to have this much aggression put into them in their own homes.
Thanks all