Overview of Canine Lungworms. Lungworms are a type of parasite that can infect the respiratory tract in dogs. There are several different parasites that have been identified including: Paragonimus kellicotti, Capillaria aerophilia, Filaroides and Osleri spp.verview of Canine Lungworms. Lungworms are a type of parasite that can infect the respiratory tract in dogs. There are several different parasites that have been identified including: Paragonimus kellicotti, Capillaria aerophilia, Filaroides and Osleri spp.