Teacup: 4 pounds (1.8 kg) or less; height typically under 10 inches (25 cm)

Miniature: 3 to 12 pounds (1.3 to 5.5 kg); height typically 10 to 15 inches (25 to 38 cm)

Toy: 5 to 12 pounds (2.2 to 5.5 kg); height typically 10 to 12 inches (25 to 30 cm)

Small Breeds: Less than 12 to 22 pounds (5.5 to 10 kg); height typically 10 to 15 inches (25 to 38 cm)

Medium Breeds: 24 to 57 pounds (11 to 26 kg); height typically 15 to 25 inches (38 to 63 cm)

Large Breeds: 57 to 100 pounds (26 to 45 kg); height typically 23 to 28 inches (58 to 71 cm)

Giant Breeds: 100 pounds (45 kg) or more; height typically over 28 inches (71 cm)