Join Date: Jul 2010
Location: Cobourg, Ontario, Canada
Cats seem to recognize sneezing as a sign of weakness. I've always noticed that when I sneeze my cats come and meow at me, get in my face and are concerned. Cats will pick on a weaker one, so that might be what triggered it. Since you got Vincent at 10 weeks, he really missed out on an important socialization period with his littermates, as from 7-14 weeks that is the age when they learn their cat manners. What is too hard a bite, when play is too rough, toleration of being pounced on and when to sheath their claws. Some cats will learn to play nice but some never really do, and you really just have to take measures to discourage any really bad fighting by keeping cats separated. Sometimes even that doesn't work and a cat needs to be rehomed where it is an only cat. Male cats, even tho neutered, tend to be more territorial by nature than females, and it could be Vincent thinks Leo is intruding too much in his territory.
So what to do? When you see your cats interacting well, always reward them for good behavior, with affection, treats or with play. You could disagree with Vincent's behaviour when he goes after Leo by going after him and stomping you feet, saying a stern No! at the same time and giving him a hard unblinking stare. This is showing him that you are the alpha in the house and don't like what he's doing and will object to it. Often in a group of cats, one of them will be the policeman or referee. I had a female that would not tolerate any fights and would get in between the combatants and box both their ears. They respected her as the group alpha, and would stop fighting and then walk away and behave. Do balance your discipline with lots of loving to Vincent when he is being a good boy. I always believe it's better if you can modify behavior rather than having to resort to medication. I think a vet visit for Leo would be a good idea as well.
I commend you for all the care you've given Leo and especially Caesar, many people would not have gone to the lengths that you have. Let us know how things go.