Filaroides hirthi infection in a dog.

A 5- to 7-month old, female dog developed a cough and labored breathing. Filaroides hirthi larvae were recovered from a fecal specimen by use of sodium nitrate flotation and direct saline solution mount. Verminous pneumonia caused by F hirthi was diagnosed. The dog appeared to be immunocompetent, and responded to treatment with fenbendazole.