Authorities say a dog in a yard near a police mounted unit event in Wilmerding escaped and bit one of the participating horses.
Allegheny County police say its mounted unit and one from Pittsburgh were in the area last Wednesday talking to a citizens police group about the duties and responsibilities of the units.
Police say a dog that hadn't been properly secured escaped from a yard and bit a Pittsburgh police horse named Jack, leaving the animal with puncture wounds on his front legs and near his back legs.
The dog was quarantined while officials tried to determine whether it was up-to-date with all vaccinations. A vet examined the horse, which appeared to be experiencing no further problems.
Police are reviewing the incident.