Presumptive primary pulmonary mast cell tumor in 2 dogs.

Two dogs were presented, each with a large solitary pulmonary mass, and cytology confirmed mast cell tumor (MCT) in each dog. One dog was euthanized following diagnosis. Thoracic computed tomography scan and exploratory thoracotomy of the second dog revealed a right pulmonary mass that would require a radical lung resection.

Seroprevalence of Borrelia burgdorferi, Anaplasma phagocytophilum, Ehrlichia canis, and Dirofilaria immitis among dogs in Canada.

The seropositivity of dogs to Borrelia burgdorferi, Anaplasma phagocytophilum, and Ehrlichia canis antibodies, and Dirofilaria immitis antigen was assessed in Canada. Borrelia burgdorferi had the highest seroprevalence, while that of Dirofilaria immitis has not changed significantly in the past 20 y. The risk for these vector-borne infectious agents in Canadian dogs is low but widespread with foci of higher prevalence.