BRUNSWICK, Maine — A dog went missing from the Coastal Humane Society on Friday, and shelter officials are asking for the public’s help in bringing him back.

Shadow, a 1½-year-old male beagle, was allegedly taken for a walk around the shelter by prospective adopters who forgot to bring him back.

“They basically slipped away with the dog,” said Customer Relations Manager Lisa Smith.

Smith said shelter officials reported Shadow’s disappearance to Brunswick police immediately. The dog is being treated for Lyme disease, which can be debilitating for the animals.

“We don’t intend to prosecute anyone. We just want the dog back,” Smith said.

Shadow is microchipped through a system called 24PetWatch, Smith said, and his identification number is 958121012869327.

“If he does show up at a vet clinic and they scan him it will admit his microchip ID number,” she said.

Smith said this type of incident has never happened before at the facility.

“We’re fearing the worst but we’re hoping for the best,” she said.

Anyone with information on the dog’s whereabouts should contact the shelter at 773-7377 and ask for manager Aggie Purinton, or Brunswick police at 725-5521.

BDN sports freelancer Ryan McLaughlin grew up in Brewer and is a lifelong fan of the New England Patriots, Boston Red Sox, Boston Celtics and Boston Bruins.