@ehBeth,
I've seen a lot of photos (probably the bunnies and otters on the beautiful animals thread) where you can tell the rabbit is on a leash. I can see the reasoning, but I think it is absurd, mostly, and as I said a bit ago, getting to cruel territory, or if not cruel, just ordinary wrong.
This is all arguable, as arguably dogs (at least) like good training, if you extrapolate this to leashing dogs - but dogs are not cats or rabbits. And ehBeth, I guess I couldn't fault your friend at the farm, as bunny at least gets to explore.
Dammit, I'm going to have to read Watership Down again.