Sure, he's lost both of his ears and one of his eyes, but he doesn't look too worse for the wear, right? I mean, he still has his bow tie and everything else...
But then we see that he seems to have possibly... melted (yeah, that's right, melted!) when he tried to get a tan under the lamp.
Sure, it's kind of weird that just his back is gone, but that happens to some people, right? They only tan/burn on one side?
Grandbunny Heffelflopper seems to have gotten a tad upset about this, though, and lost his head. This is unfortunate for him and probably means he will have a harder time running away. He also seems to have lost his bow tie.
"I think I know how it is to be grown up; it's when you feel how someone feels that isn't you." -Frances Griffiths