Dog Diseases – Canine Ascariasis

Dog Diseases – Canine Ascariasis

Canine Ascariasis is caused by canine roundworms and lion roundworms in the small intestine and stomach of dogs. Mainly harms puppies between 1 and 3 months of age, affecting growth and development, and can cause death when severely infected.

Pathogen and life history

Canine roundworm (Toxoplasma canis) is pale yellowish white, with 3 lips on the head, and a long and narrow neck wing membrane on the side of the body. Canine roundworms are characterized by a small stomach at the junction of the esophagus and the intestine. The males are 50-110 mm long with a curved tail; the females are 90-180 mm long with a straight tail. The lion roundworm (Toxoplasma lionii) is similar in color and morphology to the canine roundworm, but without a small stomach; the male worm is 35 to 70 mm long, and the female is 30 to 100 mm long.

Ascaris canis eggs are excreted with feces and develop into infectious eggs under suitable conditions. The puppies under 3 months of age swallow the infectious eggs, hatch the larvae in the intestines, burrow into the intestinal wall, go through the lymphatic system to the mesenteric lymph nodes, then reach the liver through the bloodstream, and then follow the bloodstream to the lungs, the larvae It passes through the alveoli, bronchioles, bronchi, and then through the larynx to be swallowed into the human stomach, and then to the small intestine to further develop into adult worms. The whole process is 4 to 5 weeks. After an older dog swallows an infectious worm egg, the larvae follow the bloodstream to reach various tissues and organs of the body, forming cysts. The larvae remain vigorous but do not develop further; after a bitch with cysts in the body becomes pregnant, the larvae are activated. Migrate through the placenta to the liver of the fetus and cause intrafetal infection. After the fetus is born, the larvae migrate to the lungs, and then migrate to the gastrointestinal tract to develop into adults. Mature canine roundworms have appeared 23-40 days after the birth of the puppies. Newborn puppies can also be infected by sucking colostrum, and the larvae develop directly into adults in the small intestine after infection.

The lion roundworm eggs develop into infectious worm eggs under suitable external conditions. After being swallowed by dogs, the larvae escape in the small intestine, penetrate into the intestinal wall, and then return to the intestinal cavity. They develop into adults after 3 to 4 weeks. .

Diagnosis points

(1) The clinical symptoms gradually lose weight. The mucous membranes are pale. Loss of appetite, vomiting, abnormal addiction, digestive disorders, diarrhea first and then constipation. Occasionally there are epileptic convulsions. The abdomen of the puppies is enlarged and development is slow. When the infection is severe, roundworms are often excreted in the vomit and feces, and the diagnosis can be confirmed.

(2) Laboratory inspections can use saturated brine flotation method or direct smear method. Check the eggs in the stool to confirm the diagnosis.

Prevention

(1) Regular inspections and deworming puppies are inspected once a month, and adult dogs are inspected once every quarter. If sick dogs are found, they will be dewormed immediately. Available levamisole. 10 mg/kg body weight is taken orally. Or use mebendazole, 10 mg/kg body weight, twice a day. Consecutive serving for 2 days. Sulfenidazole 15 mg/kg body weight or pyrantel (Kangchangling) 5-10 mg/kg body weight, taken orally. Or use piperazine citrate (Quili Ling) 100 mg/kg body weight, orally.

(2) Do a good job in cleanliness and sanitation. The environment, troughs, and food must be cleaned and sanitation seriously, and the feces should be removed in time, and the fermentation process should be carried out.

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