Copper may have been used as a "bait dog" in a dogfighting ring

Copper arrived at Bobby and the Strays, a shelter in Long Island, New York, this weekend, in bad shape.

“He was freezing, shaking and he wasn’t even moving,” Elyse D’Agostino, manager of the shelter, told NBC New York. “He was just curled up in a little ball as if he was sleeping.”

The dog was emaciated, severely dehydrated, had an extremely low body temperature, and was barely able to stand. He was also covered in fresh bite marks, D’Agostino added, signs that he may have been used as a “bait dog” in a dogfighting ring.

But just a few days later, Copper is doing much better, and showing few signs of his tragic past. Though he’s still about 15 pounds underweight, D’Agostino says he’s going to make a great pet for a family looking to adopt. “He is so sweet,” she said, “When he sees people, he gets excited.”

The shelter has security camera footage of a man who dropped Copper at the shelter’s front steps in a duffel bag, and authorities are seeking to question him.