That number may be rare, but rarer still is the fact that Milly herself was born in a litter of 16 six years ago.
The puppies were delivered via C-section in Shropshire, England. "During the cesarian the vet pulled out eight puppies and gave a sigh, so we thought that was it – but there were still eight more to go," says owner Lisa Elvins. "The vets were amazed."
Not all of the puppies will stay with Milly. The Elvins family will keep one of the dogs and find homes for the 15 others.
Elvins Family / Getty