Washington state law holds dog owners strictly liable for their dog's behavior, including attacks or bites on people or other domestic animals, regardless of whether the owner knew the dog was dangerous. This means if a dog bites or attacks someone on public or private property, the owner is responsible for any resulting damages or injuries.

Key points about dog behavior and liability near neighbors in Washington include:

• Strict liability for dog bites: Owners are liable if their dog bites a person or domestic animal, even if the dog has no prior history of aggression.
• Definition of dangerous dogs: Dogs that bite unprovoked, chase or approach people in a menacing way, or have a known tendency to attack can be classified as dangerous.
• Leash and confinement requirements: Dogs must be restrained by leash or confined on the owner's property. A "dog at large" is one not confined or restrained and off the owner's property without permission, which can lead to liability or penalties.
• Dogs injuring livestock or domestic animals: It is lawful for a person to kill a dog found chasing, biting, or injuring their livestock or domestic animals on their property or public highways. The dog owner must keep the dog confined or leashed after being notified of such behavior.
• Animal control enforcement: Local animal control agencies have authority to enforce leash laws, dangerous dog declarations, and other regulations to protect public safety.

In summary, Washington law emphasizes owner responsibility and public safety regarding dog behavior near neighbors. Owners must control their dogs to prevent attacks or nuisances, or face strict liability for any harm caused.