. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 30 CmCTTLAE 338, U. S. DEFT. OF AGRICULTURE. PiQUEE 29.—Egg o£ the serrate dog tape- worm, Taenia piBifor- mis. Enlarged. From Eailliet, 1893. bothrium latum, and the cat tapeworm, Taenia taeniaeformis (synonym, T. crassicollis), the latter species being the most important. Taenia taeniaeformis is from 6 inches to 2 feet (15 to 60 centimeters) long, the head is armed with a double circlet of hooks, and the suckers, four in number, are pronainent, pointing forward and outward; there is no neck, segmentation beg
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 30 CmCTTLAE 338, U. S. DEFT. OF AGRICULTURE. PiQUEE 29.—Egg o£ the serrate dog tape- worm, Taenia piBifor- mis. Enlarged. From Eailliet, 1893. bothrium latum, and the cat tapeworm, Taenia taeniaeformis (synonym, T. crassicollis), the latter species being the most important. Taenia taeniaeformis is from 6 inches to 2 feet (15 to 60 centimeters) long, the head is armed with a double circlet of hooks, and the suckers, four in number, are pronainent, pointing forward and outward; there is no neck, segmentation beginning immediately back of the head, and the first segments being as broad as the head or broader. The bladder-worm stage of this tape- worm occurs in the hvers of rats, mice, muskrats, and other rodents. Cats become infested by eat- ing the infested livers of these animals. Symptoms. — In general, tapeworms in the dog may cause disturbances in appetite and digestion, a disposition to vomit, general restlessness, and sometimes cramps. In heavy infestations they may cause an inflammation of the digestive tract and occasionally cause occlusion, or stoppage, of the intestine by filling and blocking the intestinal lumen. In addition, tapeworms in heavy or even Ught infeistation may cause more or less weU-marked nervous disturbances, in some cases simulating rabies. The passage of a segment or a string of segments through the anus often causes itching or irritation, mani- fested by the dog's sitting down and dragging itself forward on its haunches. This symp- tom is sometimes said to be due to pinworms in the dog, but dogs do not have pinworms. The com- mon double-pored tapeworm is especially likely to cause this symptom, and sieg- ments of this worm are sometimes referred to as pinworms or rectal worms. Cats infested with Taenia taeniaeformis may show loss of appetite, transient diar- rhea followed by constipa- tion, salivation and, in some cases, persistent vom- iting. In kit
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