Preheat your oven to 400°F. Line two half-sheet pans with silicone baking mats or parchment paper and set aside until ready to use.
Line another half-sheet pan with a double layer of paper towels. Remove the hot dogs from the packages and lay them in a single layer on the prepared pan. Then, top the hot dogs with another layer of paper towels to make them as dry as possible.
Remove the capers from the jar and place them on a smaller paper towel-lined pan or plate. To get them as dry as possible, layer paper towels on top.
When the hot dogs are dry, thinly cut the ends of each one. Then, use a ruler to cut the hot dog in half evenly. Throw the ends away. Set the hot dog halves aside until ready to use.
Next, unroll the crescent dough sheet onto a large cutting board. Then, using a ruler and a pizza wheel, cut the dough sheet into 32, 1x3-inch pieces.
Put on a pair of vinyl gloves and wrap a piece of crescent dough around the center of one of the hot dog halves.
Then, stand the hot dog up on its end and use a small kitchen knife to make two cuts going only as far down as the dough, cutting the hot dog into four pieces, to form four of the legs. Turn the hot dog over and cut the other end the exact same way, to form the other four legs.
Place seam side down on one of the prepared sheet pans. Repeat steps six and seven until all of the hot dog pieces are wrapped. Place 16 on each of the prepared sheet pans.
To make the egg wash, crack the egg into a small bowl, then add the water. Then, use a fork or a small whisk to combine them.
Brush the egg wash over the wrapped hot dog pieces.
Then, press two capers into the dough to form the eyes of the spiders.
Bake the pans one at a time in a 400°F oven for 12-15 minutes, or until golden brown.
Serve with sides of ketchup and mustard with a spiderweb design in an alternating condiment on the tops of each.
Yield 32 Spooky Spiders in a Blanket