Whether hot off the grill or plucked from a cart’s mucky waters, no single food is more synonymous with the summer season than that all American mongrel, the hot dog. Thanks to some of Philly’s enterprising chefs, the old dog is learning some tasty new tricks lately. With the July 4th holiday ahead, we decided to search the city for some of its best dogs. And with this slideshow we present what we found. Some are new creations, while others are timeless classics. Click through and let us know which ones you think look the most appetizing.