Anonymous wrote:guillotine style, any brand, replace them often so they're always sharp.
But this seems to be a behavioral thing rather than an issue with the tool/tool quality. Train your dog to let you trim its nails, and then dremel them. This is part of basic dog handling. If you decide you'd rather pay someone else to do it, fine, but the responsibility for training your dog to the task falls to you as its owner.
NP but I have seen that this is a doodle trait.
I cut and handle my doodles paws every day since she was a tiny puppy and cutting nails is a battle ever single time.