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Internal parasites play a very important part in the lives of the majority of dogs. On the highest authority we are assured that something like 70% of dogs have tapeworm in England, and this proportion is exceeded on the Continent.
The principal worms which we need notice are of two kinds, the round and the flat. The ascarides and other round worms are most frequent in puppyhood. The flat or tapeworm class are to be found in adults, principally. The life-history of ascarides is not clearly made out, Pups a few days old have been known to have them in a well-developed state. Tapeworms pass an intermediate life in some other animal. There are a number of distinct species, but it will suffice to say that one dog cannot give tapeworm direct to another, and all the known varieties have an intermediate bearer. Causes Eating uncooked food, and water or matter containing ova. The viscera of hares and rabbits contain an intermediate form of tapeworm. In the dog the imperfect parasite is hatched and fixes itself to the intestine, developing into a worm of many segments in a short time. Each of these segments is capable of producing 30,000 eggs. Another tapeworm passes its intermediate life in the body of the parasite, so that the bearer, in biting himself, swallows the cyst, Whipwormshich contains the head of a new worm, and this again fastens on to the dog's bowel, and develops as described above.
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