I looked up the information for Pennsylvania and they do not have a dangerous dog list - they declare it by what the dog does
Here is what I got off of the PA law site
Will certain breeds of canines be banned? Upon opting to implement a dog law enforcement program, third class cities become authorized to establish their own dog law ordinances; however, they cannot impose breed specific prohibitions due to Section 507-A (c) of the Dog Law.
Will Act 151 afford greater protection to citizens from dangerous dogs? Yes, Act 151 strengthens the current dangerous dog provisions by clarifying that harboring a dangerous dog is a summary criminal offense and that a dog may be declared a "dangerous dog" as a result of a single attack. In addition, Act 151 requires a dangerous dog to be confined in a proper enclosure from the time the charge is filed through the resolution of any appeal and requires the reporting of incidents in which dogs attack humans