And they're off! Your pooch will be in first place this Halloween in this clever Jockey Rider Pet Dog Costume. This super creative Jockey Rider Pet Costume fits right onto your dogs back for a hilarious look! Getting through the Preakness in this Jockey Rider Pet Dog Costume is not sweat. Place your bets that this costume is a winner. Jockey Rider Pet Dog Costume includes; harness with a saddle and miniature jockey. One size fits most dogs. Neck strap--20-26" Stomach--20-28".