i took some vet assistant training on this...i do know there is a vet-approved method for this. HOWEVER, if you do restrain a rabbit by the scuff, you NEED to hold his bottom legs. they can't just dangle...they'll kick out and possibly break their own spines because their kicks are so powerful. there's a way to hold the bottom legs as well so they are restrained, if you have a very jittery and wiggly rabbit. i highly advise AGAINST this method, unless your have been trained in this by a professional, veterinarian, etc. even at your local vet clinic, this form of handling is usually reserved only for when the rabbit needs to be actually CARRIED, yet is not docile for whatever task at hand & needs to be restrained for it's own safety. i personally prefer the towel method or table method of restraining if at all possible, because there's less that could go wrong with unpracticed hands. if you use the scruff method, its better not to simply just wing it, for you could end up injuring the rabbit. you really need to have someone teach you this hands on, so that if you make a mistake they can correct you.