I have had my Zeus for about 5 months now. We got him as a baby and he's grown like crazy! And he has realized that he's gotten bigger now too. As a baby, he was fine with my cats as long as he was in his cage. I had to lock them up to get him out or he would get scared. He now realizes how big he is and torments them. They will both watch from a distance but get scared when he gets too close. It has become a game for him when they are near, he will creep up to them, stop for a minute, and then charge at them until they run away. (Never has attempted to bite any of my pets. He actually loves to climb up on my dog and look around)