Harness size Weight Circuference of Chest
Xsmall 5-7 lbs 14-16 Inches
Small 7-10 lbs 16-19 Inches
Medium 11-18 lbs 19-23 Inches
Large 20-29 lbs 20-29 Inches
Collar Size Circumference of Neck
Xsmall 8-12 Inches
Small 10-14 Inches
Medium 13-20 Inches
Large 17-28 Inches