Check out Rubie’s Costume Company Halloween R2D2 Dog Costume here. Check out Rubie’s Costume Company Halloween Walking Groot Dog Costume here. Star War fans, get in here! Your pup will make Groot look even better as he struts around the neighborhood as one of Marvel’s favorite sidekicks! I haven’t talked enough about how much I LOVE Harley’s costume from Strange Love Adventures, avengers costumes designed by @JonSommariva. My second stage four colon cancer diagnosis.