search no farther,,here is the answer,,,what goes in must go all the way through,,rabbits may cough,but lack the muscles to throw up,,there-fore we need to increase water intake and fiber(70%),ie.timothy/orchard grasses,,.rabbits are consumate groomers,chewers,,try branchs/twigs off/from a fruit tree,,paper isnot bad it is fiber,,generally cardboard/ boxes,paperbags,are toys,,might just need more fiber in the diet,,grasses are better,,try some dandylions,clovers grasses/don,t cost anything--perhaps wash first before feeding,.//.feel their little bellies,put them up to your ear and listen for any violent sounds,,feel for any hardness,,work their gi tract from the stomach to the pooper,,well it is 105* now i gotta go make my rounds,,,sincerely james waller