We have an adult or senior bunny Little Doll. She is spayed. She has a large x-pen in a room and allowed to run around freely sometimes.

We wanted to get a friend for her. Yesterday we brought a new bunny home: 3 months old, not neutered yet. Our agreement with the owner was that if the bonding doesnt work out we can take the bunny back.

I noticed major differences in their behavior. Little Doll is always quiet. Most of the time she sits in the corner box with bedding and hay. She jumps around but not a lot. She would not go up a ramp the leaded to the hutch outside. My husband had to saw the hutch legs shorter so she would go in. She is not interested in any bunny toys that we got for her. The new bunny is full of energy. He is extremely interested in his surroundings. Once he got used to the room yesterday, he kept charging around doing binkies all the time. I’ve never seen Little Doll do a binky. She keeps her x-pen very clean and recently learned to use her litter box around 80% of the time. He definately creates a lot of mess by throwing hay around, jumping around and playing. He acts like a real, young, active, happy bunny. He is not yet litterbox trained but he used it a few times already.

They seemed to get along well. We had them both in the kitchen under supervision. She didnt pay much attention to him. He was more interested in her, following her around. Most of the time each of them their doing their own things, grooming, chewing on hay, etc. When he approached her on several occasions, both of them seem to want the other bunny to groom their head, but non of them actually licked the other. The problem arised when he started chasing her into a corner and tried to mount her. We had to gently push him away. He was very intense and he is physically bigger and stronger. She didnt seem to like it. She also seemed to be disturbed when he was zooming around inside her x-pen. Couple of times she chased him out of her hiding den. I wanted our bunny to have a friend but not to create additional stress for her.

The new bunny is a sweetheart. But I am not sure if they are a good combination. Also, I feel that our 6′ X 3′ xpen provides enough room for her for most of the time. However, a young and energetic bunny probably needs more exercise room.

Should I take him back to the owner and find a senior friend for Little Doll or keep the young bunny? My main concerns are if he creates stress for her and if he needs more room and higher maintenance than we can provide.

I would appreciate advice.