The size of a Sheltie (at the withers) can range from being undersized (under 13 inches) to being oversize (over 16 inches.) The average height of a Sheltie in the United States according to the AKC Standard is between 13 - 16 inches. A measurement of either below 13 inches or above 16 inches will result in being dismissed from the conformation ring. Being dismissed three times will result in the dog being banned from any more conformation classes.
The Shetland Sheepdog is an outstanding companion dog and is intensely loyal. It is lively, intelligent, trainable, and willing to please and obey. Shelties are loving, loyal, and affectionate with their family, but are naturally aloof with strangers; for this reason Shelties must be socialized. Some can be quite reserved. Shelties do well with children if they are raised with them from an early age; however, their small size makes it easy for a child to accidentally injure them, so supervision is necessary. Exercise caution when considering an adult Sheltie for a family with young children; they may not be compatible.
Shelties are vocal herding dogs. Correct Sheltie temperament is intensely loyal, affectionate and responsive to his owner; reserved but not shy or fearful . Some shelties display a terrier-like personality, which tends to be hyper, and always on the go; however, this temperament is not sanctioned in the breed standard. Some Shelties can be very timid but this temperament is specifically discouraged by the breed standard . Tendencies towards shyness can be reduced through proper socialization. The average Sheltie is an excellent watch dog, giving alarm barks when a person is at the door, or a car is in the driveway.
Like the Rough Collie, there is a tendency toward inherited malformation and disease of the eyes. Each individual puppy should have his eyes examined by a qualified veterinary ophthalmologist. Some lines may be susceptible to hypothyroidism, epilepsy, hip dysplasia, or skin allergies. The expected life span for Shelties is between 10-15 years, although some Shelties are shorter lived, and some are longer lived.
Dermatomyositis may occur at the age of 4 to 6 months, and is frequently misdiagnosed by general practice veterinarians as sarcoptic or demodectic mange. The disease manifests itself as alopecia on the top of the head, supra- and suborbital area and forearms as well as the tip of the tail. If the disease progresses to its more damaging form, it could affect the autonomic nervous system and the dog may have to be euthanized. This disease is generation-skipping and genetically transmitted, with breeders having no clear methodology for screening except clear bloodline records. Deep tissue biopsies are required to definitively diagnose dermatomyositis.
Von Willebrand disease is an inherited bleeding disorder. In Shelties, affected dogs as a general rule are not viable and do not live long. The Sheltie carries type III of von Willebrands, which is the most severe of the three levels. There are DNA tests that were developed to find von Willebrands in Shelties. It can be done at any age, and it will give three results: affected, carrier and non-affected. Shelties may also suffer from hypothyroidism, which is the under-functioning thyroid gland. Clinical symptoms include hair loss or lack of coat, over or under-weight, and listlessness. Research is currently ongoing to further understand the thyroid.
Although small breed dogs are not usually plagued by hip dysplasia, it has been identified in Shelties. Hip dysplasia occurs when the head of the femur and the acetabulum do not fit together correctly, frequently causing pain and/or lameness. Hip dysplasia is thought to be genetic: many breeders will have their dogs' hips x-rayed and certified by the Orthopedic Foundation for Animals.
Eyes
The two basic forms of inherited eye diseases/defects in Shelties are Collie eye anomaly (CEA) and progressive retinal atrophy (PRA).
CEA can be detected in young puppies by a veterinary ophthalmologist. The disease involves the retina. It is always bilateral although the severity may be disparate between eyes. Other accompanying defects (ophthalmic anomalies) may wrongly indicate a more severe manifestation of CEA. CEA is present at birth and although it cannot be cured, it doesn't progress.
That is, the severity of the disease at birth will not change throughout the dog's life. CEA is scored similar to the way hips are. In some countries, the Sheltie gene pool is limited so breeders will breed with a very low scoring CEA. However, most breeders are actively trying to breed this disease out by only breeding with dogs that have "clear" eyes or very low scoring eyes. A CEA score considered too high to breed with may still be low enough not to affect the dog's life. These dogs live happy and healthy lives as pets but should be not used for breeding. Most breeders have all their adults and every litter tested. Some breeders will supply a certificate from the vet to all their puppy purchasers.
