You are probably not going to like this, but in the eyes of the law, a pet is propertyy. As such, it will be treated as property regardless of what legal action you pursue. In many cases, victims of a pet injury would have more success by seeking a remedy directly from the responsible party rather than through a premises liability action.
The state of Pennsylvania provides an Amusement Ride Safety Division within the Department of Agriculture. This division is responsible for inspecting, approving and registering all amusement attractions in the state. Owners of these attractions also play a role; they are required to register each attraction with the Department and to submit affidavits of inspection before the attraction begins operating.