My three (now down to 1) dogs all hated nail trimming. I mean I tried everything and no doing. Take them to the groomer for trimming and not a peep, not a twist, NOTHING from any of them when the groomer does it. They stand perfectly still on that table and just stare at me. P*$$ me off but it is less stressful from them and it actually gets done. $20 per dog. 

I guess my point is, have you tried a groomer or has your vet techs tried to trim their nails? Might have the same reaction as my dogs....