A dog owner in western Kansas is seeking justice after his dog was apparently strangled.

Justin Underwood says that his 9-year-old Border Collie named Mac ran away last week. He says that two days later he got a call from a woman claiming she shot the dog because it was harassing her goats.

Underwood says he went to the Clark County Sheriff’s Office after finding no evidence of gunshots or metal fragments in the X-ray.

The sheriff’s office sent the dog’s body to a research lab at Kansas State University, which found that the dog had been strangled.

Underwood says Mac was trained to herd cattle and would not have hurt other animals. He says he does not understand why the woman killed him.