Sleepypod allows pets to travel safely in the pampered comfort of their own bed made of luxurious ultra-plush and foam alleviating the stress associated with travel and confinement. Once your pet becomes accustomed to using the Sleepypod as a ulrta comfortable bed; zip Sleepypod's sturdy mesh top onto the luggage-grade ballistic nylon bed with machine washable liner and Fifi (or Fido) is ready to travel in their own bed. Strap your car's seat belt around the Sleepypod and it turns into a car seat in seconds. Size small will fit dogs up to 12.5 lbs. Size xsmall will fit dogs up to 5.5 lbs.