Edit: I totally missed that there was a second page! What a traumatic ordeal for both Peter and you guys. I've lost two rabbits to GI stasis over the years and treated it a number of times successfully. In fact, we lost our beloved Layne to something similar in late January after we were able to get him to the vet but didn't have the money to go for the most aggressive treatment options. There's little in life that's more worrisome to me than a rabbit shunning their favorite foods entirely. I really hope this story has a happy ending - please keep us updated! Hubby and I and our little warren are sending lots of positive thoughts Peter's way!
Original response:
3 1/2 weeks ago (can't believe that's all it's been!), we adopted a big ol' Californian boy ("meat" rabbit breed; devours anything and everything, especially if it's leafy and green) and a finicky little Dutch girl. We've got them bonded already and housed near our other two (non-bonded) girls. The other day, I attempted to feed the rabbits edible flower pedals in lieu of their small nightly ration of fruit. Alice got offered one first and looked at me like I was crazy, shunning it instantly... but when she saw Nala and Big Bunny (the Cali) both destroying theirs, she pressed her face to the cage bars like she was asking for some - when I offered again, she inhaled the pedal! I went to the other end of the duo's enclosure to offer Harley a pedal and she had zero interest in it... until Big Bunny ran up and I gave him a second piece, then Harley was suddenly not only willing but eager to try one.
They're really silly (and much like humans) that way, lol. When someone else gets super excited about something or vouches for it or w/e, we tend to be more open to trying it too - rabbits are the same way. The more he knows and trusts your other bunny, the more likely he is to learn the hay-eating habit from her.