Princess, after being startled, broke free from her owner on the 200 block of Hansberry in Germantown. She bolted down the road, crashing into a car a few blocks away.
Leon Stover of Germantown tells Action News, "I heard this loud thump... boom... and I see the horse rolling off the car running up Green Street."
A brother and sister who were in the car were treated at a local hospital. Their car is mangled, but their health is largely intact.
Princess kept going. Her owner chased after her in his car.
An off duty officer finally corralled Princess some 10 blocks from here home, but not before running into at least one other car and almost hitting several people.
Princess' future is uncertain. The 6-year-old filly suffered a deep gash to her front right shoulder and a possible fracture to her rear hock.
The SPCA says Princess' owner has 5 other horses on the property... but it's perfectly legal. Officials say the other horses are in good shape, and this appears to be just an accident. No charges will filed.