Idaho Code § 25-2201

Any person having a field of [or] enclosure with a “lawful fence” as described in chapter 1, title 35, Idaho Code, entirely surrounding the field or enclosure shall have a special lien upon, and may take up any domestic livestock such as cattle, horses, mules, donkeys, sheep, goats or other domestic livestock which break into the enclosure. The lien will include the care and feeding of the livestock and other charges as provided for in chapter 23, title 25, Idaho Code, in relation to estrays. The lien is not dependent upon possession. It may be perfected by following the provisions of this chapter which are required of the lien claimant.