PetSTEP Portable Folding Dog Ramp w/Side Entry Support Strap Combo, Dogs and Cats The PetSTEP ramp is designed for everyday use for virtually any dog size providing a safe passage into the rear of your vehicle. The grooved surface provides a safe non-slip platform for a dog's paws; we don't use abrasive coatings like sand paper that may deteriorate the ramp over time and cause damage to your clothes or vehicle, not to mention your dog's paws. You can use your PetSTEP ramp in any weather condition without worrying if your pet will sustain an injury while in use. Included is a side support strap unique to only the PetSTEP ramps; its purpose is to provide support for use in the back seat of any vehicle. The strap, which is made of heavy duty nylon, allows a person to easily connect one end of the strap to the ramp, while the other end slips over the frame of your door. This allows your pet to climb into your vehicle without the ramp tipping on its own.