So with these dudes, everything was always calm and peaceful... Until one day Noki snuck outside while I was letting my cousins dog inside. When he came back a few hours later and I let him in, Scooter absolutely freaked out and attacked him. Chased him all through the house hissing and spitting. Had to keep them separated for a week or so and give them treats together to ease them into a shaky truce. Things have gotten better but there are still occasional spats for no reason. Cats gonna cat I guess.