What was max wearing in the night before Christmas?

In "How the Grinch Stole Christmas!" by Dr. Seuss, Max, the Grinch's dog, is depicted wearing a simple red collar. While the story focuses primarily on the Grinch and his plans to steal Christmas, Max's attire is minimal and doesn't attract much attention. His loyalty and companionship to the Grinch are the key aspects of his character, rather than any specific clothing.