The Penalty for Killing an Estray or Wild Horse after October 1, 1999  is a Category C Felony

NRS 206.150 Killing, maiming, disfiguring or poisoning animal of another person; killing estray or livestock.

      1.  Except as otherwise provided in subsections 2 and 3, any person who willfully and maliciously kills, maims or disfigures any animal belonging to another, or exposes any poison or noxious substance with intent that it should be taken by the animal is guilty of a category D felony and shall be punished as provided in NRS 193.130, and may be further punished by a fine of not more than $10,000.

      2.  Except as otherwise provided in NRS 205.220, a person who willfully and maliciously kills an estray or one or more head of livestock, without the authority to do so, is guilty of a category C felony and shall be punished as provided in NRS 193.130.

      3.  The provisions of subsection 1 do not apply to any person who kills a dog pursuant to NRS 575.020.

      4.  As used in this section:

      (a) “Estray” means any livestock running at large upon public or private lands in this state, whose owner is unknown in the section where the animal is found.

      (b) “Livestock” has the meaning ascribed to it in NRS 205.219.

      [Part 1911 C&P § 488; RL § 6753; NCL § 10435]—(NRS A 1961, 402; 1967, 513; 1979, 1395; 1999, 2515; 2001, 2891)

NRS 193.130 Categories and punishment of felonies.

      1.  Except when a person is convicted of a category A felony, and except as otherwise provided by specific statute, a person convicted of a felony shall be sentenced to a minimum term and a maximum term of imprisonment which must be within the limits prescribed by the applicable statute, unless the statute in force at the time of commission of the felony prescribed a different penalty. The minimum term of imprisonment that may be imposed must not exceed 40 percent of the maximum term imposed.

      2.  Except as otherwise provided by specific statute, for each felony committed on or after July 1, 1995:

           (c) A category C felony is a felony for which a court shall sentence a convicted person to imprisonment in the state prison for a minimum term of not less than 1 year and a maximum term of not more than 5 years. In addition to any other penalty, the court may impose a fine of not more than $10,000, unless a greater fine is authorized or required by statute.

            [1911 C&P § 18; RL § 6283; NCL § 9967]—(NRS A 1967, 458; 1995, 1167; 1997, 1177; 1999, 1186)