We have an almost 10 year old Russian Tortoise. He/she was bred in captivity and we have had him since he was the size of a half dollar. About 4 years ago he/she started pounding against his cage, so we slowly started allowing him to free range throughout the house. (S)he opens most of the summer on the porch and then comes in for the cooler months. (S)he has access to her cage to go in and out freely and seemed to be happy. Last summer, the kids left him/her out and she was rogue in the city for 8 days until I found him/her a block away. Every since then (s)he would occasionally bite toes if they were barefoot. It was pretty occasional. Well the last few months it has become continually worse. Now (s)he spends her time aggressively chasing humans or our cats and will bite, hard. The cats used to allow the tortoise to cozy up to the fireplace with them, but now they are all afraid of him/her and just take off. That makes him/her more aggressive in chasing. I am not sure what we can do at this point to try to bring our tortoise happiness. (S)he would is miserable in the cage, and just repeatedly throws it's body against the walls. We have a large home and only one kid left at home? Should we try to give him/her just one room to be in charge of? Also, for the record, I am referring to our tortoise as he/she because we have been told by the vet that her size and flat bottom shell indicate she is a female, but from everything I read it is def exhibiting male behaviors.