Ethel, a lop-eared rabbit from the UK, lost the use of her hind legs after falling ill.
According to Holbourne, “At first she struggled to keep her balance and kept tipping over, but she soon got to grips with it, especially on flat surfaces. Now she loves it. The wheelchair is very effective and it stops moving as soon as she wants it to. It doesn’t roll along when she is standing still.”
I have seen disabled bunnies using carts before, but I’m not sure how common it is. From what I’ve seen, some people have been able to build their own bunny wheelchairs, and there are several companies that can custom build them as well, including:
Here’s a video of Blueberry, a disabled rabbit at the Toronto Humane Society, using a cart.
For more info: http://www.telegraph.co.uk/earth/3483678/NEEDSPICDisabled-rabbit-gets-wheelchair.html