In this story from Canada, where even the dogs seem to be nicer, a recently adopted momma dog named Maggie (whose own puppies recently left to go to their own homes) was staying at Barkers Pet Motel and Grooming when she heard the cries of two new foster puppies after the humans left. Maggie somehow escaped her own cage and searched the facility for the source of the distress calls, comforting the puppies (Hanna and Kari) and laying down in front of their cage until the humans finally came back. 

Sources: CBC