In ancient Greece, kennels of dogs were kept at the sanctuary of Asclepius at Epidaurus. Dogs were frequently sacrificed there because they were plentiful, inexpensive, and easy to control. During the July 25 celebration of the kunophontis ("the massacre of dogs"), dog sacrifices were performed to appease the ancestors of Apollo's son, Linos, who was devoured by dogs.
That is a very interesting dog fact. Thank you for sharing.