Skin Disease, Autoimmune (Pemphigus) in Dogs
Pemphigus in Dogs
Pemphigus is the general designation for a group of autoimmune skin diseases involving ulceration and crusting of the skin, as well as the formation of fluid-filled sacs and cysts (vesicles), and pus filled lesions (pustules). Some types of pemphigus can also affect the skin tissue of the gums. An autoimmune disease is characterized by the presence of autoantibodies that are produced by the system, but which act against the body's healthy cells and tissues -- just as white blood cells act against infection. In effect, the body is attacking itself. The severity of the disease depends on how deeply the autoantibody deposits into the skin layers. The hallmark sign of pemphigus is a condition called acantholysis, where the skin cells separate and break down because of tissue-bound antibody deposits in the space between cells.
There are four types of pemphigus that affect dogs: pemphigus foliaceus, pemphigus erythematosus, pemphigus vulgaris, and pemphigus vegetans.
In the disease pemphigus foliaceus, the autoantibodies are deposited in the outermost layers of the epidermis, and blisters form on otherwise healthy skin. Pemphigus erythematosus is fairly common, and is a lot like pemphigus foliaceus, but less afflictive. Pemphigus vulgaris, on the other hand, has deeper, and more severe, ulcers because the autoantibody is deposited deep in the skin. Pemphigus vegetans, which affects only dogs, is the rarest form of pemphigus, and seems to be a gentler version of pemphigus vulgaris, with somewhat milder ulcers.
Symptoms and Types
Your veterinarian will perform a thorough physical exam on your dog, including a blood chemical profile, a complete blood count, a urinalysis and an electrolyte panel. Patients with pemphigus will often have normal bloodwork results. You will need to give a thorough history of your dog's health and onset of symptoms. Possible incidents that might have precipitated this condition should also be reported to your veterinarian (e.g., exposure to sun).
A skin exam is crucial. A skin tissue sample will be taken for examination (biopsy); and pustule and crust aspirates (fluid) should be wiped onto a slide to diagnose pemphigus. A positive diagnosis is achieved when acantholytic cells (i.e., separated cells) and neutrophils (white blood cells) are found. A bacterial culture of the skin may be used for identification and treatment of any secondary bacterial infections, and antibiotics will be prescribed in the event that there is a secondary infection present.
A product made of fluid, cell waste, and cells
Having the ability to produce disease
A lesion on the skin that is filled with pus
The disappearance of the signs and symptoms of a particular disease; this is often used in association with cancer
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
A medical condition in which the pancreas becomes inflamed
Any type of pain or tenderness or lack of soundness in the feet or legs of animals
The process of removing tissue to examine it, usually for medical reasons.
Any disease in which an animal's body creates antibodies that are used against itself.
The outside layer of the skin
The area between the abdomen and thighs; the inguinal area
A protein in the body that is designed to fight disease; antibodies are brought on by the presence of certain antigens in the system.
Small structures that filter out the lymph and store lymphocytes
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