Border Terriers are generally healthy, but like all breeds, they can get certain health conditions. Not all Border Terriers will get any or all of these diseases, but it's important to be aware of them if you're considering this breed.

If you're buying a puppy, find a good breeder who will show you health clearances for both your puppy's parents. Health clearances prove that a dog's been tested for and cleared of a particular condition.

In Border Terriers, you should expect to see health clearances from the Orthopedic Foundation for Animals for hips and from the Canine Eye Registry Foundation (CERF) certifying that the eyes are normal.

Because some health problems don't appear until a dog reaches full maturity, health clearances aren't issued to dogs younger than 2 years old. Look for a breeder who doesn't breed her dogs until they're two or three years old.

The following problems are not common in the breed, but they may occur:

• Hip Dysplasia is a condition in which the femur doesn't fit snugly into the pelvic socket of the hip joint. Hip dysplasia can exist with or without clinical signs. Some dogs exhibit pain and lameness on one or both rear legs. As the dog ages, arthritis can develop. Screening for hip dysplasia can be done by the Orthopedic Foundation for Animals (OFA) or the University of Pennsylvania Hip Improvement Program (PennHIP). Dogs who have hip dysplasia shouldn't be bred. If your dog displays signs of hip dysplasia, talk to your vet. Medication or surgery can help.
• Heart defects of various kinds can affect Border Terriers, the most common of which is pulmonic stenosis, a narrowing of the valve that separates the right chamber of the heart from the lungs. If your Border Terrier has a heart murmur, it may indicate that he has a heart condition that will need to be monitored and treated. Heart murmurs are caused by a disturbance in the blood flow through the chambers of the heart. They're graded on their loudness, with one being very soft and six being very loud. If disease is evident, as diagnosed through x-rays and an echocardiogram, the dog may require medication, a special diet, and a reduction in the amount of exercise he gets. The best way to avoid heart defects is to check that the breeder has not used dogs with heart defects in her breeding program.
• Malocclusions, meaning the dog's jaws don't fit together correctly, are sometimes found in Border Terriers. There are three different types of incorrect bites. An overshot bite is when the upper jaw extends past the lower jaw. This causes difficulties in grasping; in more severe cases, the lower teeth can bite into the roof of the mouth, causing serious injuries. An undershot bite is when the lower jaw extends out past the upper jaw. Although it is standard in some breeds, it can cause difficulties in Border Terriers and may need to be corrected with surgery. The last type of incorrect bite is wry mouth, a twisting of the mouth caused when one side grows more quickly than the other. It causes difficulties with eating and grasping. In some cases, puppies grow out of these incorrect bites, but if the bite hasn't become normal by the time the puppy is 10 months old, it may need to be corrected surgically. If this is the case, wait until the puppy has finished growing. Corrective surgeries can include tooth extraction, crown height reductions, or the use of spacers. Dogs with incorrect bites, even if the bite is corrected surgically, should not be used for breeding.
• Seizures can be caused by a number of factors and can occur at any time. Signs of a seizure include sudden trembling or shaking, sudden urination, stiffness, staring, slight muscle spasms, or a loss of consciousness. Seizures aren't curable, but they can be successfully managed with medication.
• Patellar Luxation, also known as "slipped stifles," is a common problem in small dogs. It is caused when the patella, which has three parts-the femur (thigh bone), patella (knee cap), and tibia (calf)-is not properly lined up. This causes lameness in the leg or an abnormal gait, sort of like a skip or a hop. It is a condition that is present at birth although the actual misalignment or luxation does not always occur until much later. The rubbing caused by patellar luxation can lead to arthritis, a degenerative joint disease. There are four grades of patellar luxation, ranging from grade I, an occasional luxation causing temporary lameness in the joint, to grade IV, in which the turning of the tibia is severe and the patella cannot be realigned manually. This gives the dog a bowlegged appearance. Severe grades of patellar luxation may require surgical repair.
• Hypothyroidism occurs when the body can't maintain sufficient levels of thyroid hormones. Signs include weight gain, thinning coat, dry skin, slow heart rate, and sensitivity to cold. As hypothyroidism is a progressive condition, if you notice any of these signs, have your dog checked by your vet. Hypothyroidism is easily managed with daily medication, which must continue throughout the dog's life. Because this is a disease of middle age, asking the breeder about the thyroid status of your puppy's grandparents may give you a better idea of whether the problem occurs in the breeder's lines.
• Cryptorchidism is a condition in which one or both testicles on the dog fail to descend and is common in small dogs. Testicles should descend fully by the time the puppy is 2 months old. If a testicle is retained, it is usually nonfunctional and can become cancerous if it is not removed. When the neutering takes place, a small incision is made to remove the undescended testicle(s); the normal testicle, if any, is removed in the regular manner.

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