Kurgo Tru-Fit Smart Harness with Plastic Quick-Release Buckles, X-Small, Brown/Tan Secures dog in the car to avoid driver distraction; also great for walking Plastic quick release buckles Five adjustment points and broad padded chest plate for a perfect fit Use with any seatbelt (tether included) or Kurgo's Auto Zip Line (sold separately) Size XS fits dogs 5-10 lb. (2-5 kg), with 9-13" (23-33 cm) neck and 12-18" (30-45 cm) chest