THE FLEECE MATERIAL ON THIS TOY PICKS UP YOUR DOG'S SCENT WHICH MAKES THESE TOYS A FAVORITE WITH DOGS. YOU CAN ALSO TRANSFERE YOUR SCENT ONTO THIS TOY, TO COMFORT YOUR DOG WHEN YOU ARE AWAY. IT IS EASY TO CLEAN JUST THROW IN THE WASHING MACHINE (i SUGGEST NOT ADDING FABRIC SOFTENER AS MY DOGS HATE THAT SCENT ON THEIR TOYS.