From Dog

Thrombocytosis in dogs refers to a marked elevation in circulating thrombocytes (platelets) > 9 x 1011/L.

This condition, which is invariably a secondary phenomenon to other diseases[1], is relatively common in dogs associated with splenic contraction observed during general anesthesia, or following splenectomy.

Pathological conditions which also cause thrombocytosis include:

- especially Hepatic carcinoma, malignant histiocytosis, lymphoma, mast cell tumor

Regardless of cause, affected dogs have a high risk of developing thromboembolism due to the increased hypercoagulable hemodynamic state.


  1. Neel JA et al (2012) Thrombocytosis: a retrospective study of 165 dogs. Vet Clin Pathol 41(2):216-222