Please be sure to measure the width of your dog's paws carefully, it is key to choosing the correct size for your dog, weight can only be used as an additional reference; Size 1: 1.7''x2.2''(W*L) for 12-23 lbs; size 2: 1.8''x2.4''(W*L) for 18-27 lbs; size 3: 2.0''x2.5''(W*L) for 23-33 lb; size 4: 2.2''x2.6''(W*L) for 31-40 lbs; size 5: 2.4''x2.8''(W*L) for 40-55 lbs; size 6: 2.6''x3.0''(W*L) for 52-65 lbs; size 7: 2.8''x3.2"(W*L) for 63-75 lbs; size 8: 3.0''x3.3"(W*L) for 74-88 lbs