The tail is naturally moderately short, thick at the base and tapering. Narrow-bodied and well-proportioned, males stand at the shoulder, and weigh ; females and . The Border Terrier has a double coat consisting of a short, dense, soft undercoat and harsh, wiry weather- and dirt-resistant, close-lying outer coat with no curl or wave. Health Borders are a generally hardy breed, though there are certain genetic health problems associated with them, including: Hip dysplasia Perthes disease Various heart defects Juvenile cataracts Progressive retinal atrophy Seizures Canine epileptoid cramping syndrome (CECS) A UK Kennel Club survey puts their median lifespan at 14 years and listed a maximum age of 22 years, one month. See also Dogs portal List of dog breeds References FCI breeds Terriers Dog breeds originating in Scotland Dog breeds originating in England