Hi:wave:
Well, I would say the one doing the chasing is a Doe. I had a good look and I could not see anything to suggest it was a Buck. The strange thing is this is the very timid rabbit which is doing the chasing. It also pulls the fur out of the other ones tail. I have not been able to check the other one as it is not as docile, and I find it very difficult trying to get it to stay on its back without kicking around.