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Identification of microfilaria in a mammary mass aspirate from a female dog.

A filarial nematode larva (microfilaria) was found in an aspirate of a mammary mass from a dog imported to Saskatchewan from Myanmar. This was an unusual location for a microfilaria and numerous filarial nematodes infecting dogs in Asia had to be considered. This report describes the laboratory diagnosis of canine heartworm disease in this dog.