Dogs allowed to roam the streets are not only a nuisance and dangerous to the public, but are in constant danger from cars, irate people, and even other dogs. For these reasons, all dogs must be on a leash or confined on the owner’s premises at all times. Dogs in violation of Jeffco’s leash law may be detained by a citizen and turned over to Animal Control. Impoundment and board fees must be paid by the owner before the dog can be released. Failure to claim an impounded dog does not relieve the owner of liability for payment of all fees.
In addition to impoundment fees, owners can be issued a summons for a violation of county regulation. Each violation of a regulation constitutes a separate offense.
Both the City of Littleton and South Suburban Parks and Recreation District require that, outside of designated off-leash parks, pets must be on a leash at all times. Both park rules and city ordinances specify that the leash cannot be more than six feet long. Please check signage posted at any park before allowing your dog to roam freely.

Also, please become familiar with TrailMark’s Dangerous Dogs Policy:
https://www.trailmark.org/wp-content/uploads/2024/04/DangerousDogsPolicy_20240312.pdf
View the following links for more information from Jefferson County Animal Control:
https://www.jeffco.us/673/Animal-Control
https://www.jeffco.us/DocumentCenter/View/375/Animal-Control-Regulation-Ordinance-PDF
