n Norris, Montana, north of the national park.

 I cannot fathom how I would feel if I had been taking the vacation of a lifetime, and looking for all these memorable experiences in one of the most beautiful places on earth, and lost one of my family members there,  Boucher said.

Boucher tracked sightings of Luna and said the dog retraced her family's steps from the day before she was lost, sneaking into eateries or lodges they had visited.

Locals and tourists called out Luna's name or chased her, triggering her fight-or-flight response and driving her further into the park, Boucher said. The volunteers set a live trap using the family's scent to lure Luna in, avoiding food that could attract bears or other wildlife.

Time was running out as winter closes in

Boucher said this was the last week she would have been able to search for Luna as the approach of colder weather could potentially limit how long she could stay in the park. She was sleeping at an RV park for seasonal employees that closes next Monday.

The search had rallied locals and tourists alike. Marie Jaskula, an area resident who runs one of the park's general stores, posted signs at every park entrance urging visitors to be on the lookout for the small dog in the park mostly located in northwestern Wyoming and parts of Montana and Idaho.

 It's really hard to stress the importance of do not chase,  said Jaskula.  Everybody sees this little dog buzz across the intersection or maybe around their employee housing, and the first instinct is to call her name and chase her.