Police say the shooting death of a dog in Thomaston is being investigated as a hunting-related incident.

The dog, a 5-year-old border collie mix named Peppermint, was shot while being taken for a walk on trails behind a park around 9:30 a.m. Tuesday.

Peppermint and another dog were being walked by a friend of the owner, Amy Eesley Joy of Warren.

The dogs were off their leashes, and the woman walking them lost sight of the dogs for a few minutes.

The other dog came back to the woman whimpering. Peppermint did not return.

She took the dog to her car and then went searching for Peppermint. The dog was found lying motionless next to a tree.

The dog had a puncture wound on its chest. Joy's husband and a veterinarian believe the wound came from an arrow.

Police searched the area, but did not locate an arrow.

Thomaston Police Chief Tim Hoppe said the area behind the park is a hunting area, and dogs being walked in the area should wear orange.

Joy told the Bangor Daily News that she "would like to see justice done, especially if it was done intentionally.”

Joy is offering a $1,000 reward for information that leads to an arrest or conviction if police decide to file criminal charges.