There are a couple reasons why a dog’s eyes become cloudy. Cataracts and nuclear sclerosis. Cataracts can occur at any age, while nuclear sclerosis does not usually interfere with a dog’s vision until it becomes quite pronounced in the late stages of life.

There are many specific causes for seizures, including poisons, head trauma, brain cancer, heatstroke, liver disease, low blood sugar (hypoglycemia), meningitis or encephalitis (inflammation around the spinal cord or of the brain), and canine distemper virus infection.

Seizures caused by these disorders are diagnosed by examination of the dog, blood tests, and X-rays. Modern veterinary technology even allows for a dog to have a magnetic resonance imaging (MRI) test, which provides images of the brain. The dog’s history often provides important clues to the cause of seizures.