Nanophyetus salmincola

Adults of the trematode Nanophyetus salmincola live in the small intestine of domestic dogs and free-ranging fish-eating mammals in northwestern North America and eastern Russia.

Neospora caninum

Neospora caninum is a protozoan parasite, closely related and in several respects similar to Toxoplasma gondii, that is a major cause of abortion in cattle around the world and an ...

Notoedres cati

Mites of the burrowing mite genus Notoedres infest domestic cats and free-ranging felids, and rarely domestic dogs and free-ranging canids, around the world.

Oestrus ovis

Oestrus ovis, the sheep nasal bot, can be found in sheep farming areas worldwide, including in Canada.

Ollulanus tricuspis

The trichostrongyle nematode Ollulanus tricuspis infects predominantly cats and wild felids, and occasionally pigs, foxes and dogs, in Europe, North and South America, Australia an...

Onchocerca cervicalis

The nematode Onchocerca cervicalis occurs in horses in many regions of the world where suitable midge intermediate hosts (Culicoides species) are also present.

Oslerus (Filaroides) osleri

Adults of the nematode Oslerus (Filaroides) osleri live in nodules beneath the tracheal mucosa of dogs in many parts of the world, including Canada, and in coyotes in North Americ...

Other lungworms of dogs

An overview of several less commonly seen lungworms in dogs

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 ...

Otodectes cynotis

The ear mite Otodectes cynotis infects dogs and cats and several free-ranging carnivores around the world.

Oxyuris equi

The pinworm nematode Oxyuris equi occurs in horses around the world, including Canada.

Parascaris equorum

The ascarid nematode Parascaris equorum occurs in horses around the world, including Canada.

Physaloptera species

Physaloptera spp. are spiruroid stomach nematodes that occur primarily in cats, wild felids and occasionally dogs in North America, including Canada, as well as in South America, C...

Piroplasms (Babesia caballi and Theileria (Babesia) equi)

Babesia and Theileria are the two genera comprising the protozoan Phyllum Piroplasmorida.

Rhipicephalus sanguineus: brown dog tick

Rhipicephalus sanguineus, the brown dog tick, is a medium sized (unfed adult females are 4-5 mm long) yellowish-brown to reddish-brown tick with a dark inornate brown scutum.

Sarcocystis neurona

Sarcocystis neurona is an intracellular, apicomplexan protozoan that occurs in horses and other hosts in the Americas.

Sarcocystis species

Species of the intracellular, apicomplexan protozoan Sarcocystis occur in mammals, reptiles and birds around the world, including in Canada.

Sarcocystis species-pigs

Species of the intracellular, apicomplexan protozoan Sarcocystis occur in mammals, reptiles and birds around the world, including in Canada.

Sarcoptes species of animal origin on people

Sarcoptes mites from animals can infest people (especially from dogs, and much less commonly pigs), although such infestations are usually short-lived, resolving spontaneously in a...

Sarcoptes species — pigs

Adult mites of the genus Sarcoptes live in the stratum corneum of the skin of pigs.

Sarcoptes species — sarcoptic mange or scabies

Adult mites of the genus Sarcoptes live in the stratum corneum of the skin of dogs.

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.

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.

Simulium species — black flies or buffalo gnats

Flies of the genus Simulium (blackflies or buffalo gnats) occur in almost all parts of the world, including Canada.

Stephanofilaria stilesi

Nematodes of the genus Stephanofilaria infect cattle in many parts of the world, including Canada.

Stomoxys calcitrans — stable fly

The stable fly Stomoxys calcitrans occurs around the world. The life cycle involves egg laying in faeces or decaying and damp organic material, for example straw bedding.

Strongyloides stercoralis

The nematode Strongyloides stercoralis is primarily a parasite of people, but also occurs in dogs and sometimes cats.

Strongyloides stercoralis in people

Strongyloides stercoralis is zoonotic, and can be transmitted from dogs to people and vice versa. In the human host, the filariform larvae can cause cutaneous larva migrans as they...

Strongyloides westeri

The nematode Strongyloides westeri occurs in horses around the world, including Canada.

Strongylus edentatus

The nematode Strongylus edentatus occurs in horses around the world, including Canada.

Strongylus equinus

The nematode Strongylus equinus occurs in horses around the world, including Canada.

Strongylus vulgaris

The nematode Strongylus vulgaris occurs in horses around the world, including Canada.

Sucking lice: Haematopinus suis

In Canada pigs are hosts to the large (five to six mm) sucking louse Haematopinus suis.

Tabanids: Tabanus species - Horse Flies; Chrysops species – Deer Flies; Haematopota species - Clegs

The various genera and species of tabanids (horse flies, deer flies and clegs) occur 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.

Taenia saginata and Cysticercus bovis - beef tapeworm of people

The adult cestode Taenia saginata (beef tapeworm) and its larval stage, Cysticercus bovis, occur in people and cattle, respectively, in many parts of the world where beef is part ...

Taenia saginata and Cysticercus bovis — beef tapeworm of people

The adult cestode Taenia saginata (beef tapeworm) and its larval stage, Cysticercus bovis, occur in people and cattle, respectively, in many parts of the world where beef is part ...

Taenia solium and Cysticercus cellulosae

Taenia solium is a cyclophyllid cestode with adults found in the small intestine of people and the larval stages (Cysticercus cellulosae) found in muscle tissue of pigs.

Taenia solium and Cysticercus cellulosae - pork tapeworm of people

Taenia solium is a cyclophyllid cestode with adults found in the small intestine of people and the larval stages (Cysticercus cellulosae) found in muscle tissue of pigs.

Taenia species

The cestode genus Taenia includes several species that as adults live in the small intestine of dogs and/or cats and free-ranging carnivores around the world.

Thelazia species

The nematode Thelazia (eye worm) occurs in cattle and rarely sheep and goats around the world, including in Canada.

Tick-borne pathogens

Relative to the United States and many other countries, the burden of tick-borne pathogens that can infect pets and people is thought to be relatively low in Canada.

Toxascaris leonina

Toxascaris leonina is an ascarid nematode of the small intestine of domestic dogs and cats and free-ranging canids and felids.

Toxocara canis

Toxacara canis is an ascarid nematodes of the small intestine of dogs and free-ranging canids. It occurs around the world, including Canada, although in the northern regions of th...

Toxocara canis, Toxocara cati and visceral and ocular larva migrans in people

Toxocara canis is an ascarid nematode, related to the other ascarids in dogs and cats (Toxocara cati and Toxascaris leonina), and to the ascarids of horses (Parascaris equorum), pi...

Toxocara cati

Toxacara cati is an ascarid nematodes of the small intestine of cats and free-ranging felids. It occurs around the world, including Canada.

Toxocara vitulorum

The small-intestinal nematode Toxocara vitulorum infects cattle, buffalo, zebu and rarely sheep and goats, mostly in tropical and subtropical climates like those in Africa, India a...

Toxoplasma gondii

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Toxoplasma gondii

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Toxoplasma gondii — pigs

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Trichinella species

Historically in Canada, infection of pigs with the zoonotic nematode Trichinella, specifically T. spiralis, was a significant public health concern, but currently the national pig ...

Trichinella species in people and animals

Trichinella is a genus of zoonotic nematode that occurs in carnivores and omnivores (mammals, including people, reptiles and birds) 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.

Trichuris vulpis

Adults of the nematode Trichuris vulpis live in the large intestine of dogs and rarely cats. The life cycle is direct and the infective stage is a larvated egg.

Trictrichomonas foetus

Recognition of the Trictrichomonas foetus as an important enteric parasite of cats first occurred in the mid-1990s. Since then reports from several regions of the world have estab...

Trypanosoma cruzi

Interestingly, a serosurvey for Leishmania and other pathogens in foxhounds in the northeast of North America demonstrated widespread exposure to another flagellate protozoan — Try...

Uncinaria stenocephala

Adults of the nematode Uncinaria stenocephala live in the small intestine of dogs.