While the herd looks on, their leader and Trygge engage in what's basically a game of tag — chasing each other back and forth along the fence line.
The rules to the game are unwritten, of course, but the dog and elk respect each other enough that the interaction is safe and fun for both.
“They never seem to get aggressive with each other," Bill Vogrin, spokesperson for Colorado Parks and Wildlife, told The Dodo. "In fact, the bull could easily jump into the yard if it decided to. But they keep their distance across the fence line.”
And with any luck, this unlikely friendship will go on for many years to come.