This was my response to her
generally speaking with a thin rabbit...
ALL you have to do is give as many pellets as he wants to eat, and then add some BOSS (black oil sunflower seeds) and Rolled oats to the diet.
you can do all sorts of things for it...but remember rabbits don't much like having too much variety too fast in their diet. So it's best not to muck around too much with variety. and building up slowly is better than building up quickly. So feed GOOD quality pellets (look at a 16-17% protein feed), add some rolled oats (just a sprinkle to start and in a separate bowl) And about a tsp to start (get up to about a tablespoon) of the BOSS (also in a separate bowl, possibly mixed with the oatmeal).
FIRST though think why is this rabbit thin?
- most likely cause is worms
- second most likely cause is coccidiosis
- could be recovering from something
- bad teeth...not just the ones in front but the ones behind
So check that rabbit over thoroughly.