If you are doing the driving and taking the dog in a car or van, you can get harnesses that hook through a fastened seatbelt. They let your dog sit up and lie down, but keep her or him from flyying out the window in case of an accident or just because they saw a cat or squirrel.
Dr. Seuss~DLH (brother's cat)~June 2007-
Misty~DSH (my cat & Mooby's mom)-?-
MooBoots(Mooby) ~ DMH(Mom's cat)~July 21, 2008-
Sunshine~ Golden retriever X white german sheperd (Dad's dog)~October 24, 2008-