Related guides
Every major jurisdiction in Northern Virginia has a leash law. The details differ, including whether the owner must have "permitted" the dog to roam, but the practical takeaway is the same: leash your dog in public just about everywhere in NoVA, unless you're inside a designated off-leash area (or on rural Loudoun land covered by the county's low-density exception below).
Note: we're dog owners, not lawyers. Ordinance numbers below are current as of October 2026; localities amend their codes, so verify with your county if it matters.
Fairfax County, § 41.1-2-4
Fairfax County Code § 41.1-2-4(a) states that no dog shall run "unrestricted" in the county. It's a strict law, the owner doesn't have to have known the dog was loose to be in violation. Exceptions: dogs lawfully hunting under direct supervision, dogs in formal obedience classes or shows, sanctioned field trials, and dogs in areas the Board of Supervisors or Park Authority has designated as off-leash dog exercise areas. A dog found unrestricted may be impounded.
Read the Fairfax County Code →
Arlington County, § 2-6
Arlington County Code § 2-6 requires that all dogs be kept "secured by a leash or lead, and under the control of the owner or other responsible person," or within the owner's property limits. Like Fairfax, it doesn't require the owner to have "permitted" the escape, the standard is strict. Violations are Class 4 misdemeanors (fine up to $250).
Read the Arlington County Code →
City of Alexandria, Ord. 5-7-35(a)
Alexandria City Ordinance 5-7-35(a) makes it unlawful for an owner to permit a dog to be off the owner's premises unless the dog is "under the control of its owner or a responsible person capable of physically restraining the dog and kept secured by a leash." Note the word permit, Alexandria's ordinance targets owners who allow the dog to be off-leash, a slightly different legal standard than Fairfax and Arlington. An electronic collar does not count as a leash under Alexandria's code. Civil penalty: $50 ($100 for repeat violations within 12 months). Dogs are also prohibited on public playgrounds and school property, even leashed.
Read the Alexandria City Code →
Loudoun County, § 612.13
Loudoun County Code § 612.13 ("Running at Large") states that no dog shall be off its owner's property without being on a leash, and the owner must maintain physical control. Off-leash is allowed in securely fenced, designated dog parks under the owner's immediate supervision. Notable exceptions: lawful hunting, formal obedience classes, service animals (where a leash would interfere with their work), and, uniquely, dogs under immediate control in unincorporated areas zoned at fewer than two housing units per acre (Loudoun's rural west).
Read the Loudoun County Code →
Prince William County, § 4-23
Prince William County Code § 4-23(a) makes it unlawful for an owner to "permit or allow" a dog to run at large, defined as off the owner's property and not under control by leash, cord, or chain. (Townhouse and condo common areas don't count as the owner's property.) Owners of dogs found running at large in a pack face a $100 civil penalty per dog. Exceptions mirror the other counties: hunting, obedience classes, field trials, and county-designated dog parks.
Read the Prince William County Code →
Fauquier County, § 4-22
Fauquier County Code § 4-22 prohibits dogs running at large, defined as off the owner's or custodian's property and not under immediate control. Note the wording: Fauquier's standard is immediate control, not an explicit physical-leash mandate like the suburban counties above, which reflects its rural character. That does not make every park or trail off-leash legal, park and property rules still apply. Fauquier is largely rural and enforcement practice may differ; if you live in Fauquier, check with Fauquier County Animal Control for the current rules.
Read the Fauquier County Code →
Where off-leash IS legal
- Designated dog parks and dog exercise areas, every county above allows off-leash in areas it has specifically designated, which may be fenced or unfenced. See our Dog Parks guide for NoVA's off-leash parks.
- Your own property, all six jurisdictions allow unleashed dogs on the owner's own premises (with the usual dangerous-dog exceptions).
- Loudoun's rural exception, dogs under immediate voice control in unincorporated areas zoned under two units per acre.
- Hunting, obedience classes, field trials, most counties exempt these when done lawfully and under supervision, but check your specific county's code for the exact exceptions and whether a permit or waiver is required.
Virginia state parks: 6-foot max
Wherever you are in Virginia, state parks play by their own rule: 4VAC5-30-260 requires dogs on a leash no longer than six feet in all Virginia state parks. This overrides any county leniency the moment you enter park land. Pets are also barred from designated swimming beaches, bathhouses, visitor centers, and designated swim areas (some non-swimming shoreline areas may allow leashed pets; check the individual park's rules).
Virginia State Parks pet rules →
Leash law questions, answered
Is there a leash law in Fairfax County VA?
Yes. Fairfax County Code § 41.1-2-4 prohibits dogs from running unrestricted. Dogs must be leashed or restrained off the owner's property, except when hunting, in obedience class, or in designated off-leash areas.
Can I let my dog off leash on Northern Virginia trails?
Generally no. Most NoVA jurisdictions require leashes in public, with narrow exceptions for rural Loudoun land and Fauquier’s immediate-control standard (see the county sections above for details). On public trails, off-leash is only legal in designated dog parks and dog exercise areas; the rural exceptions described above apply to private land scenarios, not public trails. Virginia state parks require a leash no longer than six feet. When in doubt, leash up.
What is the fine for an off-leash dog in Northern Virginia?
It varies by locality. Verified amounts: Alexandria $50 ($100 for repeats within 12 months); Arlington up to $250 (Class 4 misdemeanor); Prince William County $100 per dog for dogs running at large in a pack. Fairfax and Loudoun handle violations through their general penalty schedules, check with county animal control for current amounts.