• Hip Dysplasia: This is a heritable condition in which the thighbone doesn't fit snugly into the hip joint. Some dogs show pain and lameness on one or both rear legs, but you may not notice any signs of discomfort in a dog with hip dysplasia. As the dog ages, arthritis can develop. X-ray screening for hip dysplasia is done by the Orthopedic Foundation for Animals or the University of Pennsylvania Hip Improvement Program (PennHIP). Dogs with hip dysplasia should not be bred. If you're buying a puppy, ask the breeder for proof that the parents have been tested for hip dysplasia and are free of problems. Hip dysplasia is hereditary, but it can also be triggered by environmental factors, such as rapid growth from a high-calorie diet or injuries incurred from jumping or falling on slick floors.
• Progressive Retinal Atrophy (PRA): This is a degenerative eye disorder that eventually causes blindness from the loss of photoreceptors at the back of the eye. PRA is detectable years before the dog shows any signs of blindness. Fortunately, dogs can use their other senses to compensate for blindness, and a blind dog can live a full and happy life. Just don't make it a habit to move the furniture around. Reputable breeders have their dogs' eyes certified annually by a veterinary ophthalmologist and do not breed dogs with this disease.
• Von Willebrand's Disease: This is a blood disorder that can be found in both humans and dogs. It affects the clotting process due to the reduction of von Willebrand factor in the blood. A dog affected by von Willebrand's disease will have signs such as nose bleeds, bleeding gums, prolonged bleeding from surgery, and prolonged bleeding during heat cycles or after whelping. Occasionally blood is found in the stool. This disorder is usually diagnosed in your dog between the ages of 3 and 5 and cannot be cured. However, it can be managed with treatments that include cauterizing or suturing injuries, transfusions of the von Willebrand factor before surgery, and avoiding certain medications.
• Gastric Dilatation-Volvulus (Bloat): Commonly called bloat, this is a life-threatening condition that affects large, deep-chested dogs, especially if they're fed one large meal a day, eat rapidly, drink large amounts of water rapidly, or exercise vigorously after eating. Bloat occurs when the stomach is distended with gas or air and then twists. The dog is unable to belch or vomit to rid himself of the excess air in his stomach, and blood flow to the heart is impeded. Blood pressure drops and the dog goes into shock. Without immediate medical attention, the dog can die. Suspect bloat if your dog has a distended abdomen, is drooling excessively, and retching without throwing up. He also may be restless, depressed, lethargic, and weak with a rapid heart rate. If you notice these symptoms, get your dog to the vet as soon as possible.
• Epilepsy: Chessies can suffer from epilepsy, a disorder that causes mild or severe seizures. Epilepsy can be hereditary; it can be triggered by such events as metabolic disorders, infectious diseases that affect the brain, tumors, exposure to poisons, or severe head injuries; or it can be of unknown cause (referred to as idiopathic epilepsy). Seizures may be exhibited by unusual behavior, such as running frantically as if being chased, staggering, or hiding. Seizures are frightening to watch, but the long-term prognosis for dogs with idiopathic epilepsy is generally very good. Epilepsy can be controlled with medication, but it cannot be cured. A dog can live a full and healthy life with the proper management of this disorder. If your Chessie has seizures, take him to the vet right away for a diagnosis and treatment recommendations.
• Chondrodysplasia: This genetic disorder is commonly mislabeled as "dwarfism." Dogs with the deformity have abnormally short limbs for the breed. It ranges in severity from "nearly normal" to severe crippling. In less severe cases, dogs have lived full and healthy lives but a dog that is diagnosed with chondrodysplasia or screened as a carrier should not be bred so as not to pass on the genes for the condition.

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