theres pups and theres pups same has theres dogs and theres dogs ,,some breeds are well developed if its a whippet type x it gunna be small boned and be prone to getting injurys but if its a big strong pup and plenty bone theres no harm ,,i like to start mine in a bit of long stuff first,,few bunnys then when there ready give them a long ear but make sure at the end of the nite the pup ends up with furr in its mouth ,,i always let mine get a rabbit last but if you are walking its hard ,,,we lads drive,,,