Cute. It looks like they are in a yoga class lol

I think those are zombie bunnies....

Most of you probably know this, but bunny circulatory systems are less than sophisticated, so if you can get them on their backs they basically pass out or go into "bunny trance." Doesn't hurt them as far as I know, but some like it more than others.
My first rabbit liked it, my current does not.
It's a great way to be able to trim their nails, though, if they don't mind.

I didn't know that. Zowie...I wasn't too far off. I think it's bad for dogs to stand on their hind legs for too long; their hearts aren't strong enough to keep blood supplied to the brain at that height for any length of time, and they just faint.