Pet Hammocks / Swings Silvercar by Audi August 14, 2019 16:12 Updated Pet-hammock availability is limited and on a first come first serve basis for an additional $25 for the duration of your rental! Ready to request a Pet Hammock? Please submit your request here. Related articles What's the policy on having pets in a Silvercar? Can I rent a car at one Silvercar location and return it to another? Does Silvercar offer ski racks? Does Silvercar offer car seats? What grade of fuel does the Audi A4 or Audi Q5 use?