Dog that survived Colorado avalanche remains missing one year later as clues build

• Last week, solo canine tracks were spotted and reports of distant barking also came through.
• The tracks led to parts of a deer carcass, indicating Ullr is "still feeling strong and healthy" and able to hunt, Dalbey wrote.

What he's saying: "The search for Ullr has turned into a marathon versus a sprint. I'm sure Ullr is very much in survival mode," Dalbey said.

Flashback: The latest traces come about a month after the dog was seen alive and in good condition on trail cameras, renewing hope about his return home.

What's next: Dalbey said he has set up more cameras near where the tracks were found, and a thermal drone will "thoroughly" scan the area for several days.

• He is asking for the community's continued help reporting any evidence of his dog and more donations to help pay for search team support, drones, infrared trail cameras and food for feeding stations.