Make sure to measure your dog's girth. Please see the instructional picture below to properly measure your dog's girth. Comfort Soft Vest - Includes 2 Velcro patches SIZE : (Adjustable) Chest & GIRTH: S fit girth 24" - 27" (60 - 70cm) M fit girth 26" - 31" (65 - 80cm) L fit girth 29" - 35" (75 - 90cm) XL fit girth 33" - 43" (85 - 110cm)https://contestimg.wish.com/api/webimage/558cd50b138654374d0aa9ed-11-original.jpg