Chapter 6. Sale Or Gift of California Food And Agricultural Code >> Division 11. >> Chapter 6.

A person shall not buy, sell, or accept a horse, mule, burro, or sheep, the carcass of any such animal from which the hide or skin has not been removed, or the hide or skin of such animal, unless the seller or donor gives, and the buyer or donee receives, at the time of delivery of the animal, carcass, or hide, a written bill of sale or written instrument, which states the number, kind, and brand or brand and marks of each such hide, skin, carcass, or animal, that is signed by the party that gives it.

The failure of the seller or donor to give a written bill of sale or written instrument to the buyer or donee pursuant to Section 23801 does not have any effect upon either of the following:
  (a) The validity of any sale or contract of sale of any horse, mule, burro, or sheep.
  (b) The rights of either the buyer or donee or seller or donor of the horse, mule, burro, or sheep.