Jake Dirnberger has seen his fair share of wildlife, but what happened last Thursday to his dog was unexpected.

Residents and visitors in Boulder are advised to keep an eye on increased mountain lion activity as Colorado heads into late fall and winter the city announced in a press release.

Boulder officials warn residents to be on the lookout for increased mountain lion activity, which picks up near town and other populated areas in the late fall and winter, according to a city

As the winter approaches, Boulder warns that mountain lion activity is expected to increase near the town and populated areas during the colder months.