**4. Conclusions**

This is the first report of DGCT in veterinary medicine. The diagnosis of DGCT in this case was made based on routine histopathology, special histochemistry, and immunohistochemistry with human oncology and pathology as a reference. The histopathology and immunohistochemistry of DGCT in this rhinoceros match the majority of descriptions of DGCT in humans.

**Author Contributions:** Conceptualization, A.S. and M.Z.-S.; investigation, A.S., C.-R.J.; resources, A.S., Z.Z.Z.; data curation, Z.Z.Z., R.M.M.T., C.K.Y.; writing—original draft preparation, A.S.; writing—review and editing, M.Z-S., Z.Z.Z., C.-R.J. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Federal Government of Malaysia, State Government of Sabah, and Sime Darby Foundation, and the APC was funded by Universiti Putra Malaysia.

**Institutional Review Board Statement:** Ethical review and approval were waived for this study because the study was non-experimental, and the samples analyzed were either part of clinical managemen<sup>t</sup> or obtained in a necropsy.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors thank the staff of Borneo Rhino Alliance, especially the rhinoceros' keepers and field staff for attending to the rhinoceros at the Tabin Wildlife Reserve, as well as John Payne and Abdul Hamid Ahmad for their technical support. We also thank the veterinarians at the Sabah Wildlife Department for their assistances.

**Conflicts of Interest:** The authors declare no conflict of interest.
