Size L for larger dogs. 

• LIGHTWEIGHT AND COMFORTABLE REFLECTIVE JACKET: The hunter vest with two highly prominent silver stripes, this high visibility pet vest will help keep your dog safe at night and in the day, essential during those late evening walks.
• EASY ON,EASY OFF& ADJUSTABLE: You can get it in place very quickly with the velcro across the chest and under the torso, there is a lot of velcro to overlap, so it's adjustable and easy to match up when your dog is squirming to get away.