:yeahthat
Miffy is a good example of why an unusually skinny rabbit (or skinnyfor no reason like malnourishment) should be taken to a vet.God knows what would have happened if Mummybunny hadn't!
Personally, I wouldn't add too much to their diets. Maybe asmall increase the pellets, depending on how much you are feeding, anda pinch or two of oats. But overloading them with caloriescould upset their stomachs. Plus when you make them gainweight fast, they only gain fat weight, not muscle weight like theyshould.
I do agree with MBB that some rabbits' bones are just easier to feel nomatter their weight. Fey and Sprite are like that, althoughthey were much worse when they were malnourished due to a poordiet. Then, Fey had a big belly, tight skin, rough fur, andbones sticking out everywhere. Now I can still feel herspine, but it's not bad and her hip bones aren't hard any more.