Use these three methods to teach your dog that he need not be afraid of getting his toe nails handled, cut or dremelled. Systematic desensitization (staying under threshold), wearing them down on smooth hard surfaces and using a scratchboard)
Additional tip: If you clip the nails after exercise, the dog will be less reactive and if the nails are wet (say after running in the rain for a while), they are softer and therefore easier and quieter to cut.