HANCIN Dog Car Harness:

Material:This durable dog vest harness is made of scratch-resistant oxford material (100% Polyester) to prevent against wear-and-tear.
Light: Lightweight mesh lining with soft sponge padding in the chest keeps your dog comfortable on their walks and prevents pulling.
CONVENIENT to Wear: The adjustable straps allow for a custom fit to make your pets as comfortable as possible.
Safety: Keeps your pets safe in case of a sudden stop, and keep them from distracting you when driving.
Note: This dog car seat belt suitable for most cars, but NOT fit for Kia Niro, 2011 Jepp Wrangler and 2013 Honda Pilot.

Size Guider:
Small Size: Product Length: 6.69\", Neck Girth: 8.27\" -10.63\", Chest Girth : 15.35\" -17.72\", Suitable for Pet Weight: 4.4 lb -11 lb
Medium Size: Product Length: 9.06\", Neck Girth: 10.24\" -14.57\", Chest Girth : 16.93\" - 20.47\", Suitable for Pet Weight: 11 lb - 33 lb
Large Size: Product Length: 11.02\", Neck Girth: 13.39\"-18.90\", Chest Girth : 19.29\"-24.41\", Suitable for Pet Weight: 33 lb-55 lb
Extra Large Size: Product Length: 12.99\", Neck Girth: 17.32\"-23.62\", Chest Girth : 25.20\"-32.28\", Suitable for Pet Weight: 55 lb-88 lb

Note:
Please measure your pet before you purchase.
Take each measurement a bit loose, so there would be room for your pet to move and breathe, but not too loose.