Many people allow their dog to sit or lie down freely on the front or back seat while they are driving. Unfortunately, this is a dangerous practice for both your dog and you.
These are the major risks involved with having a dog that isn't restrained by a seat belt, crate, or booster seat while you're driving:
You can see the results of AAA surveys about pets and driving here: http://exchange.aaa.com/safety/roadway-safety/pet-passenger-safety/#.WFlcnPkrJnI
If your dog is small enough, always put him in a carrier or crate while driving. The carrier or crate should be on the floor of the vehicle, to minimize the chances of it flying around during a crash.
You can use a canine seatbelt or restraint harness for your dog, to secure him in his seat so you can drive safely.
A small or medium-sized dog may fit in a booster seat. This is great for a dog that likes to look out the window, but it still keeps him secure and safer.
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