California dog laws: leash, licensing, bites and breed rules

California regulates dogs mostly through its Food and Agricultural Code, which sets up licences, dangerous-dog hearings and impoundment, and leaves the day-to-day rules to cities and counties. This summary is general information about state law and is not legal advice. Reviewed November 2026.

Leashes and licensing

State law does not impose a general leash rule on pet dogs. It does make it unlawful to keep or let run at large a dog over four months old that is not wearing a substantial collar with either an owner's name-and-address tag or a city or county licence tag.

Licences are local. Where the state's rabies rules apply, an owner must license a dog older than four months at least every two years under the local ordinance, and the city or county sets the fee.

Rabies vaccination

In rabies areas, an owner must have the dog vaccinated by a licensed veterinarian once it is three months old, at the intervals the health department sets. Puppies under four months must be confined to the owner's premises or kept under physical restraint.

When a dog bites a person, the local health officer may order it isolated and observed for 10 days after the bite. The rules allow release after five days if a veterinarian examines the dog on or after the fifth day and certifies no signs of disease.

Dangerous dogs and bites

California is a strict-liability state for bites. The owner of a dog is liable for damages to a person bitten in a public place or lawfully on private property, including the owner's own, whether or not the dog was ever vicious before and whether or not the owner knew.

For dogs that act aggressively, the Food and Agricultural Code lets an animal control or law enforcement officer ask the superior court to hold a hearing and label a dog "potentially dangerous" or "vicious." A potentially dangerous dog is one that, unprovoked, requires defensive action by a person twice within 36 months, bites causing a less severe injury, or twice attacks domestic animals. A vicious dog is one that, unprovoked, inflicts severe injury on or kills a person. A potentially dangerous dog must be licensed and vaccinated, kept indoors or in a securely fenced yard, and leashed under a responsible adult off the property. A vicious dog may be destroyed, or kept under court-set conditions, and its owner may be barred from having any dog for up to three years.

Breed-specific rules

State law bars local programs that regulate dogs by breed, with one exception. Cities and counties may adopt breed-specific rules for mandatory spay or neuter and for breeding, but they may not declare a breed or mix potentially dangerous or vicious.

Tethering and hot cars

State law prohibits tethering, chaining or tying a dog to a doghouse, tree, fence or other stationary object. A dog may be tethered only for the time needed to finish a temporary task, defined as up to three hours in 24 unless animal control approves more. Leaving an animal in an unattended vehicle where heat, cold or lack of ventilation, food or water endangers it is illegal. A person who forces entry to save an animal is protected from criminal liability only if they have a reasonable belief of imminent danger, call law enforcement, fire, animal control or 911 first, use no more force than needed, stay with the animal and hand it over to responders.

Where to check your local rule

Cities and counties often have stricter leash, licence, number-of-dogs and spay or neuter rules than the state. Check your city or county animal control website or ordinance code. If your dog has bitten someone or has been reported, talk to a lawyer or the animal-control office.