The phrase "police horse" refers to a horse that is trained and used by the police for various tasks such as crowd control, patrolling, and assisting officers in their work. Full definition
Legislative Press Release by Assemblyman Ken Zebrowski The New York State Senate and Assembly passed legislation yesterday that increases penalties for killing a police dog or police horse while on the line of duty. (rocklandtimes.com)
Alongside its main shelter in Defence Colony, it runs a clinic in South Delhi, a country sanctuary in the Gurgaon suburb — where it cares for retired police horses, who would be auctioned off to carry carts and heavy loads were they not taken in by Friendicoes — and two animal birth control centers in East and West Delhi that run the city's most successful spay and neuter program for stray animals. (onegreenplanet.org)
Look, I know you're probably grossed out by this, but this act helps make up for the Eagles fans who have been punching police horses in the face the last couple of weeks. (sbnation.com)