I too am a groomer, and would be happy to answer any questions about grooming. If you talk to your groomer, she or he would be happy to explain how they dry.
As Scissorat said, Pet Somethings only let you see what happens out FRONT. If you would like to watched your dog be groomed, ask your groomer. Most groomers will be happy for you to watch, but if you dog acts up seeing 'mommy' they might have you look from behind a corner.