. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. PARASITES AND PARASITIC DISEASES OF DOGS 19 the other Toxocara cati. The latter species is the more common and is very similar in appearance to T. canis. The female worms produce numerous eggs (fig. 16) which pass out in the feces and develop under favorable conditions of warmth and moisture, in the course of 2 or 3 days under very; favorable condi- tions, to the stage where each egg contains an infective embryo worm. When such eggs are swallowed by dogs in contaminated food or water or in other ways, the eggs
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. PARASITES AND PARASITIC DISEASES OF DOGS 19 the other Toxocara cati. The latter species is the more common and is very similar in appearance to T. canis. The female worms produce numerous eggs (fig. 16) which pass out in the feces and develop under favorable conditions of warmth and moisture, in the course of 2 or 3 days under very; favorable condi- tions, to the stage where each egg contains an infective embryo worm. When such eggs are swallowed by dogs in contaminated food or water or in other ways, the eggs hatch and the young worms enter the walls of the digestive tract, get into blood vessels or lymph vessels, and finally many of them get to the lungs, usually by way of the blood stream through the liver and heart. In the lungs they leave the blood and enter the air passages, ascend these air passages to the mouth and are swallowed. On reaching the intestine they settle down and grow to mature worms, the females beginning egg production in the course of a few weeks. Prenatal infection of the pups in the uterus of the pregnant bitch has been shown to occur with the second of the ascarids referred to above. ^These ascarids are especially injurious to pups, and as many as 2,000 have been found in one animal. They cause derangements of the appetite and digestion, and heavily infested pups become unthrifty and emaciated and may die if the condition is not reheved. When present in large numbers the worms may form masses which produce a stoppage of the bowels, they may wander into the ducts of the hver, into the stomach, causing the animal to vomit the worms, or may crawl up ,^ the esophagus and enter the FionEE lO.âEggs ot dog ascarids: a, b, e, Toxasmris lungs or nostrils. The young '^°g^^'_ i^V'*' ^'"''""''' ""'''â ^""^^'sei- ^""^ worms leaving the blood and ' i entering the air passages of the lungs may cause such serious
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