The longest living dog breeds list wouldn't be complete without the Shih Tzu. Bred to be a companion and watchdog, this is one of the most ancient breeds. Smaller than the Lhasa, this breed weighs in between 9 and 16 pounds, although there are many exceptions to this size. Their life...
Early stages of the disease usually result in poor night vision. As the disease progresses, daytime vision also fails. The dog's pupils will become dilated, and the lens of the eyes may become cloudy, or opaque, resulting in a cataract. PRA affects some dog breeds early in life, while o...