The roundworms Toxocara canis found in dogs cause toxocariasis in people. Toxocariasis is rare but affects mainly young children as they are more likely to encounter eggs in faeces and contaminated soil, and then put their hands in their mouths. Once ingested the eggs hatch inside the human bowel and the larvae can travel throughout the body. These larvae moving through the body can cause a cough and fever, or more severe symptoms such as loss of vision, fatigue, breathing difficulties and seizures.
Regular worming treatment for dogs and immediate disposal of faeces, as well as regular hand washing will help to reduce the risk of toxocariasis.