Some congenital defects (defects present at birth) are inherited from the parents, while others are caused by environmental factors in the womb, such as nutritional deficiencies or some viral infections. For many, the cause is unknown.
Puppies are born with a nervous system that is not fully developed, and birth defects may not become apparent until they begin to walk. In some cases, evidence of an inherited disorder may not be seen until the dog
Tick paralysis is a rapidly progressive motor paralysis caused by a toxin in the tick's saliva that attacks the nervous system. Certain species of ticks are known to cause tick paralysis. People (especially children) and many other animals may be affected. Human cases of tick paralysis caused by the genera Ixodes, Dermacentor, and Amblyomma have been reported in Australia, North America, Europe, and So
Rabies is a viral infection of the nervous system that mainly affects carnivores and bats, although it can affect any mammal. It is caused by the rabies virus. It causes sudden, progressive inflammation in the brain and spinal cord. Once clinical signs appear, it is fatal. Rabies is found throughout the world, although a few countries are declared rabies-free due to successful elimination programs. Islands that have a strict quarantine program in effect are often rab
Motion sickness results in nausea, excessive drooling, vomiting, and occasionally other signs, such as poor appetite for several hours after the motion sickness event. Animals may yawn, whine, show signs of uneasiness or apprehension, or have diarrhea. Motion sickness is usually seen during travel by land, sea, or air, and signs usually disappear when the motion of the vehicle ceases.
The principal cause of motion sickness is due to stimulation o
Inflammation of the meninges, the membranous covering of the brain and spinal cord (meningitis), and inflammation of the brain (encephalitis) often are seen simultaneously (meningoencephalitis), although either can develop separately. Causes of meningitis, encephalitis, and meningoencephalitis include infection by bacteria, viruses, fungi, protozoa, rickettsia, or paras
Paralysis of a leg often results from damage to the peripheral spinal nerves. Paralysis of a front leg is usually associated with injury to the nerve roots in the neck or shoulder, injury to the network of nerves found deep in the armpit (brachial plexus), or injury to the radial, median, musculocutaneous, or ulnar nerve in the leg. Paralysis of a hind leg is usually associated with injury to the nerve roots in the lower back or tailbone, the network of nerves locate
A number of parasites (including worms and insects) are associated with central nervous system disease. Diagnosis requires eliminating other possible causes of illness, such as rabies, and identifying the specific parasite responsible.
Tapeworms
Coenurosis (also called gid, sturdy, or staggers) is caused by Taenia multiceps multiceps, an in
Facial paralysis in dogs may result from injuries caused by rough handling or other trauma, such as automobile accidents, inner ear infections, hypothyroidism, tumors, and unknown causes. Paralysis on one side of the face is common when the facial nerve is damaged. Facial paralysis on both sides of the face can be more difficult to recognize, but affected animals often drool and have a dull facial expression. In total facial paralysis, the animal cannot move its eyel
Canine dysautonomia is a disorder of the autonomic nervous system, which controls many reflexes and other neurologic functions that the animal does not consciously control. Other components of the nervous system, including central, peripheral, skeletal, and digestive nerves, are also affected. Cases have been reported from both Europe and the United States, where canine dysautonomia has been seen primarily in the Midwest. Signs often include a loss of the pupillary light re
Disorders of the spinal column and cord include congenital defects (discussed above), degenerative diseases, inflammatory and infectious diseases, tumors, nutritional diseases, injury and trauma, toxic disorders, and vascular diseases.
Degenerative Diseases
Degenerative lumbosacral stenosis is a disorder of the vertebrae in the lower back that causes compression of the ner