Tumors similar to Burkitt’s lymphoma in dogs are morphologically similar to those in humans, and in the case of these tumors in the canine population, an additional high growth fraction (80% of cells positive for Ki-67) has been observed, which is similar to the nearly 100% Ki-67 value in Burkitt’s lymphoma in human patients [55]. The gene discussed is MKI67; the disease is Burkitt lymphoma.