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Dogs With a History of Violence

The one bite rule provides that a dog bite victim can recover if the dog owner knew or should have known the dog had the propensity for violent, aggressive behavior yet didn't take the proper safety measures to prevent someone from being bitten, mauled, or killed. However, there are defenses to this rule such as if the victim was trespassing on the owner's property, or if the victim provoked the dog into attacking.

A victim of a dog with a previous history of aggression or of a dog whom a reasonable pet owner would have known could bite is entitled to full compensation for his or her injuries.

Dangerous Dog Law

Dangerous dogs also have their own classification under Pennsylvania's dangerous dog law, which protects both humans and other dogs who may have been attacked without provocation. Pennsylvania law enforcement authorities can charge the owners of dangerous dogs who have attacked with harboring a dangerous dog if the dog severely injured a person or pet on public or private property without provocation, was used in the commission of a crime, or if the dog has a history of attacking people or other domestic animals without provocation. The owners of such dogs are guilty of the misdemeanor crime of "harboring a dangerous dog."

Philadelphia Dog Bites: The Basics - FindLaw