According to Funda Alp of the APPMA, "There are many easy-to-use restraint devices, including harnesses and crates, which limit distractions and keep pets and others safe while traveling."
Alp suggests you visit your local car supply store, a big pet supply depot, or her association's website at appma.org to check out the available restraint equipment.
She also suggests that responsible pet ownership includes some simple pre-travel steps so pets are "safe, secure and content while traveling."
Alp suggest that, after properly securing pets, owners should take them on a few short rides around your neighborhood to get them used to being in the car.
"With practice rides," she believes, "companion animals will be more comfortable and experience less stress before taking a longer trip."
Alp also suggests feeding a pet at least two hours before departure, scheduling a pre-vacation veterinarian visit, and packing a pet's health records and medications to take along.