Here are a couple of things that have helped me with this. First, have a leash on your dog. Either have a helper hold the leash or tie the dog to something... make it something fairly high, which limits pulling. Have some really high value treats. Start off with your dog restrained by the leash, turn on the dremel for 30 seconds or so, then give a treat. Increase to longer intervals, being generous with the treats. See if you can pet your dog while the dremel is on, more treats. My dogs still tend to pull their feet away sometimes when their feet are extended in front of them. I pick up the paw and bend the foot towards the back (have you ever seen how horses' feet are picked up? Like that.) You can use the dremel in that position easily enough, just be careful if you have a long-haired dog not to let the tip get tangled in their hair. They still aren't crazy about the procedure, but they think the treats are worth it. The more often I do it, the quicker it is and the less they seem to mind it.