All helminths (sheep)
Dicrocoelium dendriticum
The trematode Dicrocoelium dendriticum occurs in cattle, sheep and other ungulates in many parts of the world, including western Canada.
Dictyocaulus filaria
Dictyocaulus filaria occurs in sheep in many areas of the world, including Canada, where it seems to be a rare cause of clinical disease.
Fasciola hepatica
The trematode Fasciola hepatica (the common liver fluke of ruminants) infects cattle and sheep, and less commonly a range of domestic and wildlife species, around the world.
Fascioloides magna
The trematode Fascioloides magna (the large liver fluke of ungulates) occurs in several areas of the world, including parts of Canada.
Moniezia and Thysanosoma
The large cestodes Moniezia and Thysanosoma in cattle and sheep, and occasionally free-ranging ungulates, are found around the world, including in Canada.
Setaria species
Nematodes of the genus Setaria infect cattle, sheep, sometimes other domestic animal hosts, and many free-ranging ungulates around the world, including in Canada.
Setaria species — pigs
Nematodes of the genus Setaria infect cattle, sheep, sometimes other domestic animal hosts, and many free-ranging ungulates around the world, including in Canada.
Taenia ovis and Cysticercus ovis
Cysticercus ovis, the infective larval stage of Taenia ovis, a cestode parasite of dogs (and perhaps free-ranging carnivores), occurs around the world, including in Canada.
Trichostrongyles and other GI nematodes
The taxonomic family Trichostrongylidae contains most of the important gastro-intestinal nematodes of cattle around the world.