The Tibetan is a very hardy breed and is considered long-lived with most living well beyond 12 years and many to 15 or 16 years. Some problems found in the Tibetan Terrier are: hip dysplasia (HD), patella luxation (PL), progressive retinal atrophy (PRA), lens luxation (LL), hypo-thyroidism, cataracts and canine neuronal ceroid lipofuscinosis (CCL/NCL). Some of these problems have been proven to be hereditary, and conscientious breeders have screened their stock and can explain these problems and their incidence. Many breeders will have knowledge of their puppies’ bloodlines and potential buyers are advised to ask questions and inquire as to evidence of any testing done on the sire and dam.

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Congenital deafness in dogs can results from many causes (intrauterine infections, ototoxic drugs like gentamicin, liver disorders, or other toxic exposures before or soon after birth) or it can be inherited. Inherited deafness can be caused by a gene defect that is autosomal dominant, recessive, sex-linked, mitochondrial, or may involve multiple genes. It is usually impossible to determine the cause of congenital deafness unless a clear problem has been observed in the breed, or carefully planned breedings are performed. Congenital deafness has been reported for approximately 85 breeds; it can potentially appear in any breed but especially those with white pigmentation. Deafness may have been long-established in a breed but kept hidden from outsiders to protect reputations. The disorder is usually associated with pigmentation patterns, where the presence of white in the hair coat increases the likelihood of deafness. The method of genetic transmission of deafness in dogs is usually not known. There are no recognized forms of sex-linked deafness in dogs, although this does occur in humans.

The BAER test:

The hearing test known as the brainstem auditory evoked response (BAER) or brainstem auditory evoked potential (BAEP) detects electrical activity in the cochlea and auditory pathways in the brain in much the same way that an antenna detects radio or TV signals or an EKG detects electrical activity of the heart. The response waveform consists of a series of peaks numbered with Roman numerals: peak I is produced by the cochlea and later peaks are produced within the brain. The response from an ear that is deaf is an essentially flat line.

The response is collected with a special computer through extremely small electrodes placed under the skin of the scalp: one in front of each ear, one at the top of the head, and one between and behind the eyes. It is rare for a dog to show any evidence of pain from the placement of the electrodes - if anything the dog objects to the gentle restraint and the irritation of wires hanging in front of its face. The stimulus click produced by the computer is directed into the ear with a foam insert earphone. Each ear is tested individually, and the test usually is complete in 10-15 minutes. Sedation or anesthesia are usually not necessary unless the dog becomes extremely agitated, which can usually be avoided with patient and gentle handling.

source: www.lsu.edu