Marley had spending time outdoors with her family during a barbeque on Tuesday when they realized she was nowhere to be seen, CTV News Atlantic reported.
The disappearance was especially worrisome as Marley is a trained therapy dog for the family's son, Luc, who has a rare brain and genetic disorder, and is trained to alert his parents when he needs help. She had become an indispensable friend for him, as well as a family member.
Halifax police officers were called in and were out searching with flashlights and thermal imaging devices in the woods until 2 a.m. that night, but Marley did not turn up.
But Gordon came across an online posting for a lost dog who had been found. Gordon didn't have an address, but he did have postal code information, which he used to head to the corresponding neighborhood and street on Wednesday morning.
The first door he knocked on happened to be where the 2-year-old lab was residing with the woman who found her - and then he was able to bring Marley home.