I came across an interesting research article on dog injuries and fatalities at groomers:
http://onlinelibrary.wiley.com/doi/1...029.12236/full
It's probably behind a paywall for most people, but here is the abstract. I don't want to alarm people unnecessarily, but please make sure your groomer is trustworthy, and let them know about any health or behavioral issues your dog may be having:
Abstract
Procedures involved in grooming, bathing, and other pet services can often lead animals to death. Of the necropsies of 1391 animals carried out at a private diagnostic laboratory in Sao Paulo, Brazil from 2004 to 2009, 94 were dogs that died during the above-mentioned procedures. Young male dogs and small breeds like Poodle Miniature, Yorkshire Terrier, and Lhasa Apso were most frequently observed. Blunt-force trauma was responsible for the deaths of 31% of the animals, with a higher incidence of trauma to the head, characterized chiefly by fractures and nervous tissue lesions. In the other 69% of cases, the animals showed signs of stress, and died due to pulmonary edema and hemorrhage. As we cannot rule out the intentional character in some situations, this article provides veterinary forensic support for veterinarians and pet owners, especially in lawsuits, helping in finding the cause of animal's death in such pet services.