Someone must have called, and the dog cops have shown up at the F15 park.

They'll spend a couple of weeks patrolling in their white van a few times a day -- the early mornings, the after-work hours. Tickets are $80, so keep your dogs on-leash!

But the City of Denver insists it's friendly to dog-owners -- here's a list of the dog parks you can run free at.

They're doing a survey too on what you like & don't like about Denver's dog parks -- take it here.