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City of San Mateo Municipal Code.

8.02.080 PROTECTION OF ANIMAL IN MOTOR VEHICLES (County § 6.08.040).

(a) No person, other than an individual actually working a dog or other animal for ranching purposes, shall transport or carry on any public highway or public roadway, any dog or other animal in a motor vehicle unless the dog or other animal is safely enclosed within the vehicle or protected by a cap or container, cage, cross-tether, or other device to prevent the animal from falling from, being thrown from, or jumping from said motor vehicle. As used herein "motor vehicle" includes, without limitation, automobile, pickup truck and trailer.

(b) No person shall leave a dog or other animal in any unattended motor vehicle without adequate ventilation, sanitary conditions, or in such a manner as to subject the animal to extreme temperatures which adversely affect the animal's health or safety.

(c) Any animal control officer or law enforcement officer who witnesses a violation of this Section shall have the right to impound the animal if, in the officer's opinion, the animal's health or safety is or will be thereby endangered.