If you've ever wondered what the brown stuffing in your dog's bed is, wonder no more! It's most likely polyester fiberfill, a type of synthetic fiber that's often used in stuffing for pillows, stuffed animals, and, you guessed it, dog beds.
Polyester fiberfill is popular for dog beds because it's inexpensive and easy to care for. It's also hypoallergenic, so it's a good choice for dogs with allergies. And, unlike natural fibers like cotton or wool, polyester fiberfill won't hold onto moisture, which means it won't get musty or mildewy over time.
So there you have it: the next time you see your dog curled up in his bed, you'll know that he's snuggled up in a cozy cloud of polyester fiberfill.