I've had Tayda for about 2 years (she is 4 now) and Lenny joined us about 10 months ago (he is 1 year old now). Tayda is spayed, Lenny is not neutered. Tayda has a pretty alpha personality, and it's seeming that Lenny also has an alpha personality. I'm noticing now that their "playing" is getting a lot more agressive and vocal. Mostly on Tayda's part, and it seems Lenny doesn't know when to give up. They chase each other around relentlessly and Tayda always seems to get Lenny on his back, even though she is a lot smaller than he is. They both seem to play agressively with each other, neither has ever gotten hurt.
My question is: at what point do I have to start worrying about their agression toward each other? They both know I am the boss of them, but I'm hoping they figure out who is going to be the alpha dog between the two of them.