CONTROLLING ROUNDWORMS IN DOGS

It’s quite common for dogs around the world to deal with roundworms (T. canis, T. leonina). But young pups often experience the most severe effects of the resulting disease from a roundworm infection. And worst of all, dogs can become infected again and again.

In dogs, roundworm infection* is associated with:1

  • Failure to gain weight
  • Diarrhea
  • Poor hair coat
  • Potbellied appearance

*T. canis only

Roundworms

Roundworm lifecycle in dogs (Toxocara leonina)

Roundworm Lifecycle

Approximately 8-10 weeks after infection, adult roundworms release eggs in the dog’s small intestine.

Eggs are passed in the feces.

Eggs develop in the environment and become infective approximately 1 week after being passed in feces.

Infective eggs may be ingested by your pet, directly from the environment.

Paratenic hosts, such as earthworms and field mice, ingest infective eggs and become carriers of larvae that arrest in somatic tissues.

Infected vertebrate paratenic host is consumed and larvae are released in the dog’s small intestine, where larvae become adult worms.

Larvae are released from infective eggs and mature in the dog’s intestinal tract.

Roundworm lifecycle in dogs (Toxocara canis)

Roundworm Lifecycle

Approximately 2-4 weeks after infection, adult roundworms release eggs in the dog’s small intestine.

Eggs are passed in the feces.

Eggs develop in the environment and become infective 2-4 weeks after being passed in feces.

Infective eggs may be ingested by your pet, directly from the environment.

Paratenic hosts, such as earthworms and field mice, ingest infective eggs and become carriers of larvae that arrest in somatic tissues.

Humans may accidentally consume infective roundworm eggs, which can lead to the development of a zoonotic disease affecting the eye, brain and/or other organs.

Infected vertebrate paratenic host is consumed and larvae are released in the dog’s small intestine, where larvae become adult worms.

Larvae are released from infective eggs, burrow through the intestinal wall, move through the dog’s liver and lungs, are coughed up, swallowed and mature within the small intestine. During this migration, some may stop development and arrest in the somatic tissues.

Puppies may become infected by larvae through the placenta during pregnancy or the milk during nursing.

Learn about controlling roundworms