Bella's is showing dominance. Snickers is the same to Reesie, sometimes thay play/fight and then sometimes they FIGHT, SCARY FIGHT!!!! Luckily Snick will share but there are def times I tell him NO when I think he is being TOO MEAN!!! I think your're doing the right thing!!!! Mine are no where near being BFF, but I'm letting them work it out on their own. Sometimes Snick will start the play/fighting but generally it's Reesie and if Snick's not in the mood--WATCH OUT REESIE!!!!!
Give it time...I used to stress, now I am just letting it work out on it's own.
Viv