Like so many black dogs in shelters, Onyx was an overlooked gem who was a jewel to behold! One to two years old and a Labrador Retriever mix, Onyx arrived as a stray at the Sampson County Animal Shelter in North Carolina way back in May on Friday the 13th. Onyx tested positive for heartworms. Talk about bad luck! Spring turned to summer, and summer turned to fall, as poor Onyx lived in limbo at the shelter hoping for a rescue or adopter.