I have a 10 year old shepherd whippet mix (whippet sized) who is terrified of nail trims ever since the groomer got his quick, and he in turn backed away and fell off the grooming table and was nearly strangled by the leash they were using. I have been trimming them myself since then, but he has always tugged his paws away and pants terribly and is clearly terrified. I have tried conditioning with treats and paw touches but he is still terrified. I have tried a dremel and the noise scares him. He won’t even take a favorite if he knows the clippers are coming. Please help!! Any suggestions aside from having him sedated at a vet office?