All Dog Breeds >>Health of Tibetan Spaniel
Progressive Retinal Atrophy
Progressive retinal atrophy is a problem with this breed. The disease is an inherited form of blindness in dogs that occurs in two forms: generalized PRA and central PRA. Generalized PRA is primarily a photoreceptor disease and is the form found in Tibetan Spaniels. The clinical signs have been observed between 1½ and 4 years, but as late at seven years. The disease is painless and affected dogs become completely blind. Currently there is no treatment, but affected dogs generally adapt well to their progressive blindness.
The earliest clinical sign of progressive retinal atrophy is "night blindness." The dog cannot see well in a dimly lit room or at dusk. The dog will show a reluctance to move from a lighted area into darker surroundings. The night blindness develops progressively into complete blindness. The British institution Animal Health Trust (AHT) is at present intensively researching PRA in Tibetans Spaniels, aiming to isolate the responsible gene.
Liver Shunt - Portosystemic Shunt
A portosystemic shunt is an abnormal vessel that allows blood to bypass the liver, one of the body's filters, so that it is not cleansed. This condition is often referred to as a "liver shunt". Most shunts cause recognizable symptoms by the time a dog is a young adult but are occasionally diagnosed only later in life. Since the severity of the condition can vary widely depending on how much blood flow is diverted past the liver it is possible for a lot of variation in clinical signs and time of onset. Often, this condition is recognized after a puppy fails to grow, allowing early diagnosis. Signs of portosystemic shunts include poor weight gain, sensitivity to sedatives (especially diazepam), depression, pushing the head against a solid object, seizures, weakness, salivation, vomiting, poor appetite, increased drinking and urinating, balance problems and frequent urinary tract disease or early onset of bladder stones. A dramatic increase of these signs after eating is a strong supportive sign of a portosystemic shunt.