A band of panther sized rats attack the house

In the morning you go out to Tom's enclosed garage to get a spare beer from the micro ice box he keeps there. The garage is a mess of boxes of car parts and things Tom still has not unpacked from his move to the island. Amongst this you hear what sounds like a dog scuffling around. "Here boy!", You call and it don't come to you. You search it out and its not a dog, its a German Shepard sized rat! The thing comes right at you! You spin and run into the house slamming the garage door behind you. The rat is chewing on the door from the other side. You go to Tom's den and get a shotgun. You then go round up the others to have them check it out.