Melophagus ovinus
The ked Melophagus ovinus is a Dipteran (two-winged fly) without wings, and occurs on sheep around the world, including in Canada.
Oestrus ovis
Oestrus ovis, the sheep nasal bot, can be found in sheep farming areas worldwide, including in Canada.
Otobius megnini
The Argasid (soft) tick Otobius megnini, the spinose ear tick, infects cattle, sheep, dogs, horses and occasionally people in and North America, including Canada, as well as South America, India, and South Africa.
Sarcoptes species — sarcoptic mange or scabies in cattle
Burrowing mites of the genus Sarcoptes infest cattle, sheep, goats and a range of other hosts around the world.