Preheat the oven to 375 degrees F (190 degrees C).

Unroll crescent dough. Pinch or press the perforation between the triangles to get 4 rectangular pieces. Cut rectangles in half lengthwise so you have 8 narrow strips.

Make a 2-inch slice through the center of one end of a hot dog. Cut two more 2-inch slices on either side of that, so that the 'legs' are about the same thickness. Repeat on the other end. Cut 'legs' into the remaining hot dogs.

Roll a crescent strip around the center of each dog. Place spider dogs on an ungreased baking sheet.

Bake in the preheated oven until golden brown, about 11 minutes. Dip a chopstick into some ketchup and dot 'eyes' onto each spider. Serve with remaining ketchup.