The animal shelter said the decision was “one of the hardest, if not the hardest,” they’ve had to make in 77 years of saving cats and dogs.

Sarge, the dog who attacked a volunteer at The Animal Haven Shelter, has been euthanized, according to a statement published by the shelter. Sarge’s euthanasia has been at the heart of some controversy for the North Haven shelter.

A dog at a no-kill animal shelter in North Haven was humanely euthanized today. The dog, named Sarge, was being sheltered at The Animal Haven in North Haven. The shelter previously released a statement saying Sarge had savagely mauled a volunteer unprovoked.