Who let the dogs out? Take the dog out for a walk this Halloween and have everyone wanting to give you a treat for being such a good boy in this hilarious Dog Halloween Mask. This Dog Halloween Maskcomes in one size that fits most adult males. The Halloween Mask features a dog head with great detail in the eyes, nose and other facial features. It has two eyeholes so that you can see out of it. Everyone knows that accessories can make or break a costume, so this year make it happen.