Neighbor’s Dog on Your Property in Delaware: What the Law Actually Allows

Finding a neighbor’s dog roaming your yard — digging up your garden, chasing your pets, or simply crossing your property line on a regular basis — is more than a nuisance. In Delaware, it can also be a legal matter with clear rights and remedies available to you.

Delaware has a statewide leash law, a strict liability rule for dog owners, and specific statutes that spell out exactly when you can physically intervene, when you must call animal control, and what happens to owners who ignore repeated complaints. Understanding where those lines fall puts you in a far stronger position, whether you want to resolve the problem quietly or pursue formal action.

This guide walks you through every relevant layer of Delaware law so you know what is and is not permitted when a neighbor’s dog will not stay off your property. For a broader look at how leash rules work across the state, see our guide on dog leash laws in Delaware.

Is It Illegal for a Neighbor’s Dog to Be on Your Property in Delaware?

The short answer is: in most circumstances, yes. Delaware does not have a single statute that says “a dog on another person’s property is illegal,” but several overlapping legal frameworks make it a violation in the vast majority of situations.

Under Delaware Code Title 16, Chapter 30F, a dog may not run at large outside at any time. A dog must be secured by means of a leash capable of physically restraining it. A dog is not considered at large only if it is within the real property limits of its owner, on private property with permission, or inside a vehicle being driven or parked.

That definition is important. A dog is not at large if it is within the real property limits of its owner, or on private property with permission, or within a vehicle being driven or parked. If your neighbor’s dog is on your property and you have not given permission, it is — by definition — running at large and in violation of state law.

Delaware makes it unlawful for a person to allow his or her dog to run at large, meaning the dog is not under the control of its owner. This is a statewide rule, not just a local ordinance, which means it applies whether you live in Wilmington, Dover, or a rural stretch of Sussex County.

Important Note: Some municipalities — including Newark and Dover — maintain their own animal control ordinances that may impose additional requirements beyond the state baseline. Always check your local code for any stricter rules that apply in your jurisdiction.

At-Large and Leash Laws That Apply in Delaware

Dogs are not allowed to “run at large” outside at any time in Delaware, and must be secured by an appropriate leash, unless they are on their owner’s property, on another person’s property with permission, or in a vehicle. This rule applies around the clock — there is no time-of-day exception for pet dogs in Delaware.

The following dogs are exempt from the leash requirement and need only be at heel or under reasonable control of a competent person: working dogs, which are dogs trained to hunt, herd, assist law enforcement or search and rescue personnel, or assist persons with disabilities, while actively engaged in performing such functions. Dogs in a designated off-leash dog park are also exempt while in that area.

A dog does not have to be on a leash if it is controlled by its owner and is a working dog or in a designated off-leash dog park. If a dog is found running at large, the dog and owner will be reported to the Delaware Department of Health and Social Services, and the owner could be fined $25 to $50 for a first violation. Fines escalate for repeat offenses.

There is also a separate penalty tier for biting incidents. Whoever is the owner, custodian, possessor, or harborer of any dog that, while running at large and without provocation, bites a human being or domestic animal on the property of its owner or under the owner’s immediate control, faces a civil penalty of $500 for a first violation and $1,000 for a subsequent violation.

For a detailed breakdown of how these leash rules operate and what exemptions apply in different parts of the state, see the full guide on Delaware dog leash laws.

What to Do When a Neighbor’s Dog Won’t Stay Off Your Property in Delaware

Before escalating to formal complaints, a direct conversation with your neighbor is often the most effective first step. Sometimes owners are not aware of the problem, especially when they are not at home. A neighborly discussion can be helpful. Try to work out a mutually agreeable solution, and allow the pet owner a reasonable amount of time to remedy the situation.

If talking to your neighbor does not resolve the issue, you have several practical options to consider before contacting authorities:

• Secure your boundary. A fence, gate, or motion-activated deterrent can prevent access without any legal action.
• Document every incident. Write down dates, times, what the dog did, and whether the owner was present. This record is essential if you later file a complaint or pursue a civil claim.
• Send written notice. A written letter to your neighbor — delivered in a way you can prove — creates a paper trail showing the owner was aware of the problem.
• File a complaint with Delaware Animal Services (DAS). If direct resolution fails, DAS can issue a formal warning and investigate the violation.

Pro Tip: Even if you resolve the issue informally, keep your incident log. If the dog returns weeks later, that documentation becomes the foundation of any formal complaint or civil claim.

If you are dealing with a neighbor whose animals repeatedly create problems beyond just dogs, it may also be worth reviewing neighbor’s cat in my yard laws in Delaware to understand how the legal framework differs for other animals.

Who Is Liable for Damage Caused by a Neighbor’s Dog in Delaware?

Delaware uses a strict liability standard for dog owners, which is one of the strongest protections available to property owners in the country. The owner of a dog is liable in damages for any injury, death, or loss to person or property caused by such dog, unless the injury, death, or loss was caused to the body or property of a person who, at the time, was committing or attempting to commit a trespass or other criminal offense on the property of the owner, or was committing or attempting to commit a criminal offense against any person, or was teasing, tormenting, or abusing the dog.

Strict liability means you do not have to prove the owner knew the dog was dangerous or that the owner was careless. Strict liability is a specific legal concept that only applies in limited situations. It means that a person does not have to have done anything wrong to be held liable.

The scope of recoverable damages is broad. Delaware law includes any damage caused by a dog, not just dog bites, so it could include injuries from being knocked over by a dog or even injuries sustained in a fall while being chased. Delaware law also includes damage to property, such as a broken fence, a scratched car, a torn-up yard, or a chewed-up designer coat.

Type of Harm	Covered Under Delaware Strict Liability?
Dog bite injury to a person	Yes
Injury from being knocked over or chased	Yes
Property damage (fences, landscaping, vehicles)	Yes
Injury to your pet on your property	Yes
Harm to a trespasser or person provoking the dog	No — owner is exempt

If the damage is significant, consulting a Delaware attorney is advisable. The Morris James LLP overview of Delaware dog bite and dangerous dog laws provides a useful summary of how strict liability applies in practice.

Can You Legally Remove or Detain a Neighbor’s Dog in Delaware?

This is one of the most commonly misunderstood areas of Delaware dog law. The state does give you some ability to temporarily detain a stray dog on your property, but it comes with a strict legal obligation.

No person may confine any dog which is not that person’s own lawful property without contacting the Department within 24 hours of confining such dog and providing the Department with a complete description of the dog, the exact location of the premises on which such dog is to be detained, and the name of the owner or tenant of such property.

By law, all stray dogs found and contained must be reported to DAS, or the cities of Newark or Dover animal control, within 24 hours. Failing to make that report could expose you to legal liability, even though the dog was trespassing on your land.

The presence of any dog, regardless of age, not confined on the premises of a person other than the lawful owner of such dog shall raise no presumption of theft against the owner or tenant of such premises. In plain terms, simply having a neighbor’s dog on your property does not make you a thief — but you must notify DAS promptly if you choose to detain it.

If you need DAS to come collect a dog you have secured, contact DAS at 302-255-4646 to schedule a pickup. Officers will come to your location.

Can You Harm or Kill a Dog That Trespasses on Your Property in Delaware?

Delaware law is specific and narrow on this point. You cannot harm or kill a dog simply because it is on your property without permission. The statute identifies limited circumstances where injury or lethal force is legally permitted.

Any police officer or animal welfare officer who finds a dog running at large and deems such dog to be an immediate threat to the public health and welfare may kill such dog. That authority belongs to officers, not private citizens.

For private individuals, the law permits the following:

• Any person may injure or kill a dog in self-defense or to protect livestock, poultry, or another human being at the time such dog is attacking such livestock, poultry, or human being.
• Any person may injure or kill a dog at the time such dog is wounding another dog if the dog being wounded is on the property of its owner or under the immediate control of its owner and being wounded by a dog that is running at large.

Any person who injures or kills any dog in accordance with this section shall not be held criminally or civilly liable therefor. Outside of these narrow situations, harming a trespassing dog could expose you to criminal animal cruelty charges and civil liability.

Critically, no person shall place any poison of any description in any place on the person’s premises, or elsewhere, where it may be easily found and eaten by dogs. Placing poison on your own property to deter a trespassing dog is a violation of Delaware law, regardless of the circumstances.

Important Note: The active-attack requirement is strict. Delaware law does not authorize harming a dog that is simply wandering on your property, digging in your garden, or even barking aggressively without making physical contact. If you are unsure whether a situation qualifies, call 911 or DAS rather than acting unilaterally.

When to Contact Animal Control in Delaware

Delaware Animal Services (DAS) is the primary enforcement authority for dog control issues statewide. Knowing when and how to contact them makes the process faster and more effective.

For dogs at large, improper dog housing, unsanitary living conditions, dangerous dogs, or similar complaints covered under Title 16, Chapter 30F, contact Delaware Animal Services at 302-255-4646 for New Castle, Kent, and Sussex Counties. The cities of Newark and Dover remain responsible for dog control within their city limits — Newark residents call Newark Police at 302-366-7111, and Dover residents call Dover Police at 302-736-7111.

Contact animal control in the following situations:

1. A neighbor’s dog is repeatedly found running at large on your property.
2. You have detained a stray dog and must report it within 24 hours.
3. A dog has caused physical injury to you, a family member, or your pet.
4. A dog has caused property damage and you want an official record.
5. You believe a dog poses a threat to public safety based on its behavior.

For emergencies, the guidance is straightforward. Emergencies are considered to be an immediate threat to the public or to the animal, such as an animal hit by a car or an aggressive dog at large. Non-emergency calls, such as lost pets or stray animals, will be returned the next day. For emergencies needing immediate response, call 911.

If you are also dealing with other animal-related neighbor disputes in Delaware, our guides on rooster crowing laws in Delaware and backyard chicken laws in Delaware cover how similar complaints are handled for other animals.

How to Document and Build a Case Against a Repeat Offender in Delaware

If a neighbor’s dog keeps returning to your property despite warnings, documentation is the foundation of every legal option available to you — from an animal control complaint to a civil lawsuit in Delaware courts. Start building your record from the very first incident, not after the problem becomes serious.

Here is what your documentation should include:

• Incident log. Record the date, time, duration, and exactly what the dog did during each visit. Note whether the owner was present and what was said.
• Photographic and video evidence. You should be able to provide video or audio evidence to substantiate a complaint. Time-stamped footage from a security camera or phone is especially persuasive.
• Witness statements. Statements from yourself and other neighbors, logs, or any other evidence will be collected by the investigating officer. Neighbors who have seen the same dog on your property can strengthen your case considerably.
• Damage records. Photograph any property damage and keep receipts for repair costs. Delaware’s strict liability rule means these costs are recoverable from the dog’s owner.
• Copies of prior complaints. Keep records of any complaint numbers, officer names, and outcomes from previous DAS contacts.
• Written communications with the neighbor. Save any texts, emails, or letters exchanged with your neighbor about the issue.

Be aware of how DAS handles repeat complaints. Per Delaware law, no enforcement is permitted for a second incident unless it occurs 7 days or more after the first complaint was investigated. That means you may need to wait before a second citation can be issued, which makes a detailed log of recurring incidents even more important.

If the situation escalates to a civil claim, Delaware’s strict liability standard works in your favor. A dog owner is strictly liable for any damage caused by their dog, which makes a legal claim by a victim against a dog owner more straightforward. The victim only needs to prove that they were injured by the dog, not that the dog owner did anything wrong.

For dogs that have shown aggressive behavior across multiple incidents, the dangerous dog designation is also worth understanding. A dog may be declared potentially dangerous if, on more than one occasion, it chased or pursued a human being in an apparent attitude of attack upon streets, sidewalks, or any public or private property other than the dog owner’s property. Once a dog receives that designation, the owner must comply with certain legal obligations, such as spaying or neutering, liability insurance, proper enclosures and restraints, or a warning sign.

You can compare how neighboring states handle these issues by reviewing our guides on neighbor’s dog on my property laws in New York, neighbor’s dog on my property laws in Washington, and neighbor’s dog on my property laws in Pennsylvania — all of which border or closely compare to Delaware’s approach. For additional state comparisons, see our articles on Ohio, Indiana, Florida, Georgia, North Carolina, Colorado, Texas, and Missouri.

Delaware’s legal framework gives you real tools to address a trespassing dog — from animal control complaints and civil liability claims to formal dangerous dog proceedings. The key is acting methodically: document early, communicate in writing, and contact DAS when informal resolution fails. For related animal neighbor issues in Delaware, our guides on kennel zoning laws in Delaware and beekeeping laws in Delaware cover additional situations where property rights and animal ownership intersect.