Hi, how long ago did you get Gizmo? If you've recently taken her in the past few months or so, then there's territorial issues going on. It sounds to me like Ozzy feels that HE is the head honcho and he feels that Gizmo is a threat to his position.
I would seriously let them fight it out to establish who's the official head honcho. Once that is figured out, then there should be less fighting. Of course, don't let them bite necks or draw blood, but this really does need to be "played" out by the cats.
Hi
Thanks for commenting I don't let them fight (just letting u know) and they were fixed when we got them
I have 4 cats in total:
Sasha
Marley
Ozzy
Gizmo
Thanks keep u posted
Bombay xxx
In multi cat households, there is most often fighting for the dominant position. In my opinion, this has to be played out-of course within reason, don't allow them to fight until bloodshed!
How many cats do you have? And, also, if they're not fixed, the fighting will be much much worse.