Size Weight (lbs) Neck Girth (cm) Chest Girth (cm)
Size 0 1 – 3 24 – 29 28 – 34
Size 1 3 – 6 28 – 32 32 – 37
Size 2 6 – 10 31 – 37 39 – 45
Size 3 10 – 16 38 – 45 46 – 52
Size 4 16 – 24 43 – 52 53 – 61
Size 5 24 – 35 48 – 58 61 – 71
Size 6 35 – 50 51 – 62 68 – 79