Ferrets love to burrow deep into a cosy sleep sack, and since they nap for much of the day, a warm, snug sleeping bag is one of their favourite comforts. The best are soft, warm, machine-washable and free of loose threads that could catch a claw. We compared ferret sleep sacks on softness, warmth, washability and safety, so your ferret has a cosy place to burrow and snooze.