Fifty-one of 62 sheep dogs in central Utah were successfully purged for diagnosis of cestodes in 1981. Tapeworms were identified in the purged fecal samples of 33 (64.7 percent) animals. Minimum infection rates in the dogs which were purged were: 9.8 percent for Echinococcus granulosus, 29.4 percent for Taenia pisiformis, 27.5 percent for T. ovis krabbei, 27.5 percent for T. hydatigena, and 2.0 percent for T. serialis. The prevalence of E. granulosus decreased from 27 percent in 1971 to 9.8 percent in 1981.
Jensen, Lauritz A.; Andersen, Ferron L.; and Schantz, Peter M.
"The prevalence of Echinococcus granulosus and other taeniid cestodes in sheep dogs of central Utah,"
Great Basin Naturalist: Vol. 42
, Article 5.
Available at: http://scholarsarchive.byu.edu/gbn/vol42/iss1/5