Cages

Question
What's the best cage for an elderly rabbit?

Answer
Is this bunny litter trained?  If so I suggest an X pen.  There is a photo of one here

http://www.sandiegorabbits.org/housing/x-pen-living-can-improve-your-rabbits-lif

If the bunny is not litter trained I suggest a large plastic bottom cage.  Bunnies need time out of their cage to exercise, especially elderly bunnies.  The more they exercise the less likely they are to be struck with crippling arthritis.

Good luck with your bun

Pam