Section 14-139. Disposal of horses

Whenever  any  horses  used  in  the
  department shall have become unfit for use  therein,  the  commissioner,
  instead  of causing such horses to be sold at auction, may transfer such
  horses to the custody of the American  Society  for  the  Prevention  of
  Cruelty  to  Animals,  provided  such  society  is willing to accept the
  custody thereof, to be disposed of in such manner as  such  society  may
  deem  best.  If, however, any horse so received into the custody of such
  society and formerly used in the department shall thereafter be sold  by
  such  society,  or any profit be derived from its use, the proceeds from
  such sale or use shall be paid over by such society to the commissioner,
  for the benefit of the police pension fund.