Chatfield State Park offers 70-acres of off-leash fun. A variety of terrains keep dogs interested in exploring the park. Other park features include multiple trails and ponds where your dog can take a swim. Bring water for your pup and bags to clean up after your dog. There is a fee to enter the state park and an additional nominal fee to use the off-leash area. Annual passes are available for frequent visitors.

The Beaver Brook Trail is a strenuous hike on the south rim of Clear Creek Canyon. And even though the trail isn't far from Denver, it's difficult enough that Fido will think he's on a primitive backcountry hike.

The Union Reservoir in Longmont, Colorado features a dog training area on the south side of the reservoir where dogs are allowed to roam off leash and swim in designated areas. Dogs must remain leashed in other areas of the park.

Dogs are allowed to play off-leash in a designated area of this park, located near Lowry Air Force Base.