My Umbrella is a terror right now. He is so hormonal it is crazy! I have had 2 pretty bad bites from him lately. He is going to be 12 in July. I took him to the vet to see if there was something she could do to slow him up a little. She just shook her head. They can help the females thru the "season" but not much to do for the males. I miss having him out to play, but I don't trust him on my hand right now.