From Dog

Monocytosis in dogs is defined as a marked elevation in circulating monocytes > 1.35 x 109/L.

Monocytes are usually in circulation for brief periods before migrating extravascularly to morph into tissue macrophages.

Monocytosis is frequently observed in dogs with a stress leucogram (associated with neutrophilia, eosinopenia and lymphopenia), however numerous other causes can incite this hematological change, including:

- e.g. Mycobacterium spp, Nocardia spp, Actinomyces spp
- Lymphoma, leukemia, renal carcinoma