The Chihuahua is the smallest breed of dog and is named after the state of Chihuahua in Mexico. Chihuahuas exhibit varied morphology in their small size (1-12 lbs), including skull shape, coat length and coloration. Most Chihuahuas are born with a “molera,” an incompletely fused cranium (called a fontanelle in humans), which presents no health problems.nnSpecifications:nn1:1 scalenHigh-quality polyurethane resin castn2-part skull (separate cranium and jaw)nnSkull Length 9.7 cm (3.8 in.)nSkull Width 6.4 cm (2.5 in.)nSkull Height 5.7 cm (2.2 in.)