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Note: If your Poodle does fine in the car without motion sickness, you may wish to jump down to: Can Car Rides be Dangerous for Poodles, which leads to Car Seats.
And if a Poodle panics quite a bit in the car, but their stomach seems to handle things, you may wish to try Bach Flower Essences Rescue Remedy, which is a homeopathic formula designed to provide calming relief. These are drops that you put in your Poodle's food or water about 30 minutes for a car ride.
For dogs 25 to 45+ lbs. a canine seat safety harness seat belt is a good option:
With larger dogs, you’ll find that a harness/connector belt works very well. Note that there are 2 parts to this. The harness, which distributes pressure over the shoulders, chest and back (not the neck), and the connector strap which connects the harness to the car’s seat belt.
If your Poodle already has a great harness, you can opt just for the connector belt. Or, you can obtain the set of both the harness and the connecting strap. We really like the VavoPaw Dog Vehicle Safety Vest Harness; it's comfortable and easy to put on.