I had never heard the term porch dog before, but here in the south there are thousands of doublewides with falling down porches, many of which conceal a dusty dog of indescriminate heritage, all just waiting for the chance to ambush you as you get to the second stair.

Unable to get away, you must suffer the ignominy of waiting until the owner comes out and shoos away the dog which apparently has all of the teeth that the owner doesn't have any more. I used to run into this in the rescue squad about once a month. A CO2 extinguisher was handy in the extreme cases.

TEd