Golden retriever egg challenge

The Golden retriever egg challenge is a viral video phenomenon where people put a raw egg in a dog's mouth to see if it can hold it without cracking it. #eggchallenge
History.
It began after the veterinarian Carrie DuComb read that golden retrievers had soft mouths and were thus bred to be able to retrieve things killed by hunters. She then decided to see if her dog, Sookie, would hold a raw egg in its mouth. Her 17 year old niece Haley Bowers posted a video of the dog doing this on Twitter, resulting in millions of views. Since then others have tried this with their dogs with various degrees of success.
Challenge.
Whether a dog will do it or not depends on their breed and their temperament. 
Health concerns.
The president of the Australian Veterinary Association, Dr. Paula Parker, has warned people that putting an egg in a dog's mouth could be a choking hazard and that salmonella and other harmful bacteria could be on the outside of the egg as well as the inside. 