Cestodes

From Dog

Cestodes or tapeworms are one of the most common parasites of dogs.

Cestodes that affect dogs have two basic life cycles, one involving an aquatic environment for early larval stages, and the second utilizing various vertebrate hosts such as fish, amphibians, reptiles and mammals. Some cestodes do not use intermediate hosts in aquatic environments and use terrestrial hosts, such as Dipylidium spp, which uses fleas.

In all cases, dogs become infected by eating intermediate hosts which contain larval stages of the cestode, where it grows into an adult and lives primarily in the duodenum and jejunum[1].

Treatment is effective with oral praziquantel.

Cestodes which have been documented to infect dogs include:

Parasite Location in dog Intermediate hosts Geographical distribution
Diphyllobothrium latum duodenum, jejunum fish Europe, Japan, North America
Diplopylidium acanthotetra duodenum, jejunum coprophagous insects, lizard Southern Europe, Middle East
Dipylidium caninum duodenum, jejunum flea larva Worldwide
Echinococcus granulosus duodenum, jejunum rodent Holarctic
Joyeuxiella pasqualei duodenum, jejunum lizard Southern Europe, Middle East, Asia
Mesocestoides lineatus duodenum, jejunum Amphibia, reptiles, rodents, birds Worldwide
Spirometra mansonoides small intestine, sparganosis amphibians, reptiles, rodents, birds Worldwide
Taenia taeniaeformis small intestine, coenurosis rodents worldwide


References

  1. Bowman, DD et al (2003) Feline clinical parasitology. Iowa University Press, Iowa. pp:184