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You might not think that dog Halloween costumes and that terrifying clown from It would go together, but here we are with a Pennywise dog costume! This hilariously cute costume can transform your furry BFF into the scariest clown in fiction. Fresh off the heels of It's box office success and scary sequel story, the movie's characters are sure to be among the favourite Halloween costumes this year. If you're planning a group costume, or just want the fun of dressing up your dog, this costume is sure to make your pup the most irresistible this Halloween! Check out the gallery ahead for more info about this cute costume, which comes in four sizes — because any dog deserves its chance to be very spooky indeed.