October 2006

Dog: Parasitic Bronchitis

Canine Pulmonary parasites are relatively uncommon and most infections are subclinical. Young animals are most frequently affected. The most common clinical sign is a chronic cough. Heavy infestations can cause dyspnea or be complicated by secondary bacterial pneumonia. Clinical disease often induces radiographic abnormalities. A peripheral eosinophilia is often found. Bronchopulmonary parasites are usually diagnosed by identification of parasite ova or larvae in feces or airway washings. Parasites which can be involved include Oslerus osleri, Filaroides spp., Crenosoma vulpis, Capillaria aerophilia and Paragonimus kellicotti.

November 2006

Dog: Salivary Mucocoele (PAS Stain)

A salivary mucocoele forms due to leakage of saliva from the duct into surrounding tissue (often due to inflammation or trauma) forming a foreign body reaction. The sublingual gland is most commonly affected but the parotid and zygomatic glands can also be implicated. There may be a breed predilection (toy dogs, German shepherd dogs) and usually young dogs (1-4 years) are involved. Lesions are variable but usually have a central lake of PAS positive mucin, with numerous vacuolated macrophages (also laden with mucin). This is often surrounded by fibrous tissue in more chronic cases(see picture)

December 2006

Dog: Oral Eosinophilic Granuloma

The cause of the condition is not known but a hypersensitivity-type reaction and trauma are proposed aetiologies. Additionally several strong breed dispositions have been identified and this suggests a possible genetic predisposition. Breeds affected include Siberian Huskies and Cavalier King Charles Spaniels. Male Siberian Huskies less than 3 years old are at increased risk. German Shepherd Dogs are also possibly predisposed. The condition has also been described in a Crossbreed dog and Bullmastiff and we have seen similar lesions in a Pekingese, so it seems a variety of breeds can be affected.