Size Small: Dog deer costume Neck/7.0 Inch, Chest/14.5 Inch, Back/11.0, fit weight about 3-5.5 LB, 
Size Medium: Dog deer costume Neck/7.8 Inch, Chest/16.9 Inch, Back/13.3, fit weight about 5-11.0 LB, 
Size Large : Dog deer costume Neck/11.8 Inch, Chest/20.8 Inch, Back/15.7, fit weight about 11-16.5 LB,