My roommate and I have these two cats , pumpkin who is 4 years old, and Dexter who is only 4 months old . Before we got dexter pumpkin used to be out quite a bit , after we brought dexter home though is when things changed . We got dexter when he was only 2 months and he would chase and harass pumpkin.. we’ve tried time outs and spray bottles ( which I have fixed feelings about , some say don’t use the spray bottle, some say it’s fine ) . However sadly pumkin now hides under our couch and barely comes out