For most of us, dressing dogs up for Halloween is just a fun way to amuse our friends and get loads of likes on Instagram. But for the participants of Tompkins Square Park's Halloween Dog Parade, canine costuming is a serious sport. Last Saturday, hundreds of pups participated in the 23rd Annual Dog Parade, attracting thousands of spectators (who in turn snapped plenty of photos). From "Barksy" the street artist to "Heisendog" the...chemist, click through to see our favorite doggy dress-ups — and to pick up some ideas for your own pet!