Support Betty Dyer from Florida. Her workmanship is extremely high quality. She makes each item by hand. All sales final.  This is fitted for all size dogs.  So, do check measurements. Each pet is shaped differently, the size tries to capture the closest measured fits available.  
 
XS - Neck 7-8" Chest 11-13" Weight - Less than 6 pounds
Small - Neck 8-10" Chest 14-16" Weight -4-12 pounds
Medium - Neck 10-13" Chest 8-15" Weight - 8-22 pounds
Large - Neck 13-15" Chest 19-23" Weight - 15-31 pounds