We keep a diffuser in our bedroom, which is where Abby spends much of her time. So, although it doesn't cover the whole house (not downstairs, for instance), it does still make a difference. We don't use it for aggression for Abby, but to stimuate her appetite. It does work for that. She gained a pound after we started using it.

But also, Becky, the little princess dear, does seem to be nicer lately, too! Even though she usually stays out of the bedroom because she hates Abby.

So I would say that you don't need to cover the whole house--just where he stays the most.

Here's an alternative thought...you could try Rescue Remedy, which is placed in their water. I haven't tried it, but others on Pet Talk have said it worked for their cats.


Good luck!