Dog Diseases – Canine Sarcoptes Scabiei

Dog Diseases – Canine Sarcoptes Scabiei

Canine Sarcoptes Scabiei is also called canine mange. It is caused by Canine Sarcoptes Scabiei or dog ear itchy mites parasitism. Among them, Canine Sarcoptes Scabiei is the most harmful. The disease is widely distributed all over the world. It occurs mostly in winter and is common in dogs with poor skin hygiene.

Pathogen and life history

(1) Canine Sarcoptes Scabiei is light yellow, round in shape, raised on the back and flat on the ventral surface. The size of male mites is 0.2~0.23 mm×0.14~0.19 mm; the size of female mites is 0.33~0.45 mm×0.25~0.35 mm. There are 4 pairs of stubby feet on the ventral surface. The first, second, and fourth pairs of feet of male mites and the first and second pairs of female mites have suckers with handles at their tips. The suckers are flared, with long handles and no segments.

(2) Dog ear itch mites are oval in shape, male mites are 0.32~0.38 mm in size; female mites are 0.43~0.53 mm in size. The mouthparts are short and conical. There are 4 pairs of long feet. Each pair of male mites and the first and second pairs of female mites have stalked suction cups. The stalks are short and do not segment.

The entire developmental process of canine scabies and canine ear itch mites is spent on animals, including 4 stages of egg, larva, nymph, and adult. Among them, the male mites have 1 nymph stage and the female mites have 2 nymph stages.

Mite disease is mainly caused by direct contact between healthy dogs and sick dogs or through indirect contact with kennels and utensils contaminated by mites and their eggs. Pathogens can also be spread through the clothes and hands of managers or veterinarians.

Diagnosis points

(1) Clinical symptoms of scabies mite disease, puppies have severe symptoms, which first occur in the bridge of the nose, cheeks, ear roots, and axillary areas, and then spread to the whole body. At first, the skin became red and small red nodules appeared, which later turned into blisters, after the blisters ruptured. A viscous yellow oily exudate flows out, and the exudate dries to form a scaly crust. Severe itching of the affected area. Dogs often scratch the affected area with their claws or rub on the ground and various objects, resulting in severe hair loss.

Ear itch mites parasite in the external ears of dogs, causing a large amount of ear fat secretion and lymphatic leakage, and often secondary purulent. With itching, the sick dog kept shaking his head, scratching his ears, whining, rubbing his ears on utensils, and even causing bleeding in the external auditory meatus. Sometimes rotating movement to the heavier side of the disease, later the disease may spread to the forehead and the back of the ear shell.

(2) Laboratory examination When the symptoms are not obvious enough, the scab on the skin of the affected part can be taken to check for the presence of parasites. Inspection method: At the affected area and the junction of the disease and health, scrape the scab with a scalpel until it bleeds slightly, put the scraped disease material into the tube, add 10% caustic soda (or caustic potassium) solution, boil it, and wait for the hair. After most of the solids such as, scabs are dissolved, let stand for 20 minutes. The sediment is sucked from the bottom of the tube, dropped on a glass slide, and inspected with a low-power microscope.


For dog scabies, scrub the affected area with warm soapy water to remove dirt and scabs, and then choose one of the following drugs: Deltamethrin is used at a concentration of 50 ppm, and Parhamidophos is used at a concentration of 125-250. ppm, the use concentration of diazinon is 2000-4000 ppm, and the use concentration of dimethyl ether is 250 ppm.

When treating dog ear itchy mites, you should first drop paraffin oil into the ears, massage gently to dissolve and eliminate the crusts in the ears, and then use oils containing acaricides (for example, 10 grams of realgar, 10 grams of sulfur , Soybean oil 100ml, boil the soybean oil, add the ground realgar and sulfur, wait for warmth) and apply locally.
Ivermectin or Michongding injection can also be used, the dosage is 200 micrograms/kg body weight. Subcutaneous injection. Scottish dogs are sensitive to ivermectin and should be used with caution. The preparation of ivermectin-itching Keping has a good effect on this disease. Its dosage is 1 ml/14 kg body weight, subcutaneously injected, and usually healed after 1 to 2 treatments.

While treating sick dogs, kennels and utensils should be thoroughly disinfected with acaricide drugs, and the treated dogs should be placed in disinfected kennels for breeding. Since most anti-mite drugs have poor killing effect on mite eggs, it is necessary to treat 2 to 3 times with an interval of 5 days each time to kill newly hatched larvae.


First. The kennel should be spacious, dry, light and well ventilated. It should be cleaned frequently and disinfected regularly (at least once every 2 weeks), and the feeding an

d management tools should also be disinfected regularly.

Second. Establish and strengthen the quarantine system for foreign (newly added) dogs.

Third. Sick dogs and healthy dogs should be kept and managed separately. Sick dogs that have been treated should be kept in isolation for another 3 to 4 weeks, and they can only come into contact with healthy dogs after they have recovered.

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