A mixed-breed rescue dog shook herself loose from her collar during a walk near Second and Arch Streets and attacked a Philadelphia Trolley Works carriage horse leading a tour of Old City shortly after 2 p.m. Thursday.

According to Melissa Levy, executive director of the Philadelphia Animal Welfare Society (PAWS), 6-year-old Kelly was spooked upon seeing the horse walking nearby. Philadelphia Trolley Works declined to comment. According to the police report, the horse was bitten in an upper left leg and was taken back to its stable. No humans were reported injured.

During the tussle - which lasted only seconds, according to Levy - Kelly was briefly caught beneath the cart before a combination of the horse's thrashing and the conductor's attempts to dislodge the dog allowed her to squirm free.

The dog took off toward Market Street, Levy said, but a PAWS volunteer was able to call her back. Kelly was treated for "superficial paw wounds" and was resting at the PAWS office. She arrived at the rescue shelter two months ago after her owners threw her from the window of their car. - Matt Flegenheimer