When I lived in Colorado there were pretty regular reports of Mountain Lion encounters. When they get hungry and desperate they will go after pets, and humans. One entered a couple's bedroom through the open sliding door (ground level) and took their 60 lb. Labrador Retriever, then jumped a six foot fence with it in its mouth. The cat killed the dog, then hid it under some brush to come back and get it later. The game officers were there waiting for it when it returned and they put it down.