No real comment on the quicking - it happens, but as a groomer they should really take smaller shaves off the nail until they can see the end of the quick. One small nick I understand, but several - no thanks.
For those who are new using a dremmel - just be aware that you may also be quicking them - the heat from the dremmel acts as cautery to stop the bleeding. Often times you wont even see any blood but your dog may pull away because of the pain. Just a heads up if you are new to using a dremmel.
I have one dog who you can quick with clippers and she wont even notice (the poodle of course), although Ive only ever caught just the tip. The pitty on the other hand is a huge wimp, she doesnt even like it when you look at her nails!!
And on the greyhound comment - my greyhound had LONG quicks, regardless of how many times I trimmed her nails. Luckily they were clear nails but her quicks were always right to the end. Never understood why they didnt receed like the other dogs!!