California Penal Code 399 makes it a crime to negligently allow an animal you know is dangerous to injure or kill another person. If the animal kills someone, the charge is a straight felony punishable by 16 months, two years, or three years in prison. If the animal causes serious bodily injury, prosecutors can file the case as either a misdemeanor or a felony. The law reaches any animal, not just dogs, and applies to anyone who owns, keeps, or temporarily controls the creature.1California Legislative Information. California Code Penal Code 399 – Mischievous Animals
What the Statute Actually Covers
PC 399 uses the phrase “mischievous animal” rather than “dangerous dog” or “vicious pet.” That language is deliberate. The statute covers any animal whose behavior creates a real risk of harming people, whether it is a dog, a bull, a horse, an exotic pet, or anything else capable of inflicting injury. The animal does not need to be inherently aggressive. What matters is whether it has shown a pattern or tendency to act in ways that could hurt someone if it is not properly restrained.1California Legislative Information. California Code Penal Code 399 – Mischievous Animals
That makes PC 399 broader than California’s separate “potentially dangerous dog” framework in the Food and Agriculture Code, which hinges on specific triggers like two unprovoked incidents within 36 months.2California Legislative Information. California Food and Agricultural Code 31602 – Potentially Dangerous Dog A dog does not have to be formally labeled dangerous for PC 399 to apply.
Who Can Be Charged
Liability under PC 399 is not limited to whoever holds the registration or title. The statute reaches anyone “owning or having custody or control” of the animal. A pet-sitter watching a neighbor’s dog for the weekend, a ranch hand managing livestock, or a family member keeping the animal while the owner travels can all fall within its reach.1California Legislative Information. California Code Penal Code 399 – Mischievous Animals
Handing custody to someone else does not automatically protect the titled owner, especially if they transferred control knowing the animal was dangerous and the new handler was not equipped to manage it. If you are the person responsible for keeping the animal contained at the moment something goes wrong, you are the one facing criminal exposure.
What Prosecutors Must Prove
PC 399 is not a strict-liability crime. The prosecution must prove that the person in charge actually knew the animal had dangerous tendencies before the incident. Lawyers call this element scienter, and it is the single most contested issue in these cases.1California Legislative Information. California Code Penal Code 399 – Mischievous Animals
Knowledge can be shown through prior bite reports, animal control complaints, warnings from neighbors, veterinary notes about aggression, or the animal’s own behavior around the owner. A dog that repeatedly lunged at joggers while the owner yanked it back is a dog the owner clearly knew was a risk. Prosecutors do not need a confession; they need a pattern of facts showing a reasonable person in the defendant’s position would have recognized the danger.
This requirement is a real protection against prosecution for first-time, unpredictable incidents. If a dog has never shown aggression and suddenly bites someone, PC 399 likely does not apply because the owner had no basis to expect the behavior. The line between “knew and failed to act” and “had no reason to know” is where most defenses in these cases are built.
Penalties if the Animal Causes Serious Injury
Under PC 399(b), when a mischievous animal causes serious bodily injury, the offense is a wobbler. Prosecutors choose whether to file misdemeanor or felony charges based on the severity of the injuries, the defendant’s record, and how reckless the conduct was.3California Legislative Information. California Code PEN 399 – Mischievous Animals
A misdemeanor conviction carries up to six months in county jail, a fine of up to $1,000, or both.4California Legislative Information. California Penal Code 19 – Misdemeanor Punishment5California Legislative Information. California Penal Code 18 – Felony Punishment6California Legislative Information. California Penal Code 672 – Fines for Offenses Without Prescribed Fines Courts also routinely order probation conditions and restitution to the victim for medical expenses and other losses.
Penalties if the Animal Kills Someone
When a mischievous animal kills a person, PC 399(a) applies, and there is no misdemeanor option. The charge is a straight felony, with a prison term of 16 months, two years, or three years and a possible fine of up to $10,000.1California Legislative Information. California Code Penal Code 399 – Mischievous Animals6California Legislative Information. California Penal Code 672 – Fines for Offenses Without Prescribed Fines
The collateral consequences of a felony conviction reach well past the prison sentence. You lose the right to own or possess firearms, you may face professional licensing problems, and a felony record can affect employment, housing, and immigration status.
When the Victim’s Conduct Defeats the Charge
PC 399 contains a built-in limit on who counts as a protected victim. Both subdivisions require the injured or killed person to have “taken all the precautions that the circumstances permitted, or which a reasonable person would ordinarily take in the same situation.”1California Legislative Information. California Code Penal Code 399 – Mischievous Animals If an adult ignored a posted warning, climbed into a fenced area, or deliberately provoked the animal, the case can collapse because the victim failed the reasonable-precautions test.
This standard adjusts for vulnerability. Young children are not held to an adult standard, because they lack the judgment to recognize danger the same way. People with physical or cognitive disabilities that limit their ability to protect themselves are evaluated under what was realistic for them, not for an idealized adult. These cases are intensely fact-driven, and defense attorneys treat this element as a primary line of attack.
The Related Charge for Trained Attack Dogs
Penal Code 399.5 is the companion statute for dogs trained to fight, attack, or kill. It applies when such a dog bites someone on two separate occasions, or bites once causing substantial physical injury, and the owner failed to exercise ordinary care.7California Legislative Information. California Penal Code 399.5 – Dogs Trained to Fight or Attack
PC 399.5 is also a wobbler but carries steeper penalties: up to one year in county jail as a misdemeanor, or two, three, or four years in prison as a felony, with a possible fine of up to $10,000. The statute spells out defenses that PC 399 does not: charges cannot be brought if the victim was trespassing, provoked the dog, or contributed to their own injuries. Military and police dogs acting in the line of duty are exempt. After a conviction, the court must hold a follow-up hearing on what happens to the dog, which can include an order to destroy the animal.7California Legislative Information. California Penal Code 399.5 – Dogs Trained to Fight or Attack
A Civil Lawsuit Can Run in Parallel
Criminal charges under PC 399 do not block the victim from suing for money damages, and the civil case operates under different rules. California Civil Code 3342 imposes strict liability for dog bites, meaning the owner is financially responsible even if the dog had never bitten anyone before and the owner had no reason to expect it. The victim must have been in a public place or lawfully on private property at the time.8California Legislative Information. California Civil Code 3342 – Dog Bite Liability
The practical consequence is that a dog owner can be acquitted of PC 399 charges for lack of knowledge and still lose a six-figure civil lawsuit under Civil Code 3342. California applies pure comparative negligence in civil cases, so a victim’s own carelessness reduces the payout proportionally rather than eliminating it. Homeowners insurance often covers dog bite liability, though many policies exclude certain breeds or cap animal-related payouts.
What Happens With the Animal Afterward
A bite or attack also triggers administrative consequences that run alongside the criminal case. California law requires animals involved in bite incidents to be quarantined and observed, typically for 10 days, to monitor for signs of rabies. The owner generally pays the quarantine boarding costs, which vary by county.
Local animal control agencies can also pursue a “potentially dangerous” or “vicious” dog designation under the Food and Agriculture Code. A dog qualifies as potentially dangerous if it engages in threatening behavior requiring a defensive response on two occasions within 36 months, bites someone causing less-than-severe injury, or attacks domestic animals off the owner’s property twice in three years.2California Legislative Information. California Food and Agricultural Code 31602 – Potentially Dangerous Dog A designation brings ongoing obligations such as special enclosures, mandatory liability insurance, muzzle and leash rules off the property, and annual registration fees. Violating any of those conditions is a separate offense, and the outcome of the administrative proceeding can affect the criminal case and vice versa.