Animal welfare officials are trying to determine how a dead miniature horse ended up on a street in Philadelphia's Feltonville section.The horse was found Tuesday on the 4500 block of Howard Street, the Pennsylvania SPCA said. George Bengal, director of humane law enforcement at the Pennsylvania SPCA, said there were "no obvious signs of trauma." Preliminary results of a necropsy showed that the animal had no broken bones and provided no indications as to how it died, the SPCA said. The agency is seeking to interview the horse's owner to determine what happened to the horse. "Someone knows who this animal belonged to," said Bengal. Anyone with information is asked to call the SPCA at its 24-hour hotline, 1-866-601-7722.