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R. John Berg - DVM, MS, DACVS

R. John Berg

Campus Phone:



  • MS - Colorado State University - 1985
  • DVM - Colorado State University - 1981

Board Certification

  • American College of Veterinary Surgeons
  1. Baron, J.K., Casale, S.A., Monnet, E., Mayhew, P.D., Runge, J.J., Follette, C.M., Phipps, K., Powell, M.E., Reczynska, A.I., Squire, N.T., Barton, B.A., Berg, J. 2020. Paramedian incisional complications after prophylactic laparoscopy-assisted gastropexy in 411 dogs. Veterinary Surgery.
  2. Phipps, W.E., de Laforcade, A.M., Barton, B.A., Berg, J. 2020. Postoperative thrombocytosis and thromboelastographic evidence of hypercoagulability in dogs undergoing splenectomy for splenic masses. Journal of the American Veterinary Medical Association.
  3. Oura, T.J., Hamel, P.E., Jennings, S.H., Bain, P.J., Jennings, D.E., Berg, J. 2019. Radiographic Differentiation of Cranial Mediastinal Lymphomas from Thymic Epithelial Tumors in Dogs and Cats. Journal of the American Animal Hospital Association.
  4. Grimes, J.A., Mestrinho, L.A., Berg, J., Cass, S., Oblak, M.L., Murphy, S., Amsellem, P.M., Brown, P., Hamaide, A., Matz, B.M. 2019. Histologic evaluation of mandibular and medial retropharyngeal lymph nodes during staging of oral malignant melanoma and squamous cell carcinoma in dogs. Journal of the American Veterinary Medical Association.
  5. Singh, A., Giuffrida, M.A., Thomson, C.B., Baum, J., Kramek, B., Liptak, J.M., Hyndman, P., Ringwood, B., Smeak, D., Ham, K., Berg, J., Thieman-Mankin, K., Blois, S.L., Boston, S.E. 2019. Perioperative characteristics, histological diagnosis, and outcome in cats undergoing surgical treatment of primary hyperparathyroidism. Veterinary Surgery.
  6. Bartholf DeWitt, S., Eward, W.C., Eward, C.A., Lazarides, A.L., Whitley, M.J., Ferrer, J.M., Brigman, B.E., Kirsch, D.G., Berg, J. 2016. A Novel Imaging System Distinguishes Neoplastic from Normal Tissue During Resection of Soft Tissue Sarcomas and Mast Cell Tumors in Dogs. Veterinary Surgery.
  7. Biller, B., Berg, J., Garrett, L., Ruslander, D., Wearing, R., Abbott, B., Patel, M., Smith, D., Bryan, C. 2016. 2016 AAHA oncology guidelines for dogs and cats. Journal of the American Animal Hospital Association.
  8. Ghaghada, K.B., Sato, A.F., Starosolski, Z.A., Berg, J., Vail, D.M. 2016. Computed tomography imaging of solid tumors using a liposomal-iodine contrast agent in companion dogs with naturally occurring cancer. PLoS ONE.
  9. Wendelburg, K.M., Price, L.L., Burgess, K.E., Lyons, J.A., Lew, F.H., Berg, J. 2015. Survival time of dogs with splenic hemangiosarcoma treated by splenectomy with or without adjuvant chemotherapy: 208 cases (2001–2012). Journal of the American Veterinary Medical Association.
  10. Montinaro, V., Massari, F., Vezzoni, L., Liptak, J.M., Straw, R.C., Allen, L., Cavanaugh, R.P., Berg, J., Doyle, R.S., Buracco, P., Romanelli, G. 2015. Lateral caudal axial pattern flap in 13 dogs. Veterinary Surgery.
  11. Garneau, M.S., Price, L.L., Withrow, S.J., Boston, S.E., Ewing, P.J., Mcclaran, J.K., Liptak, J.M., Berg, J. 2015. Perioperative Mortality and Long-Term Survival in 80 Dogs and 32 Cats Undergoing Excision of Thymic Epithelial Tumors. Veterinary Surgery.
  12. Wendelburg, K.M., O’toole, T.E., McCobb, E., Price, L.L., Lyons, J.A., Berg, J. 2014. Risk factors for perioperative death in dogs undergoing splenectomy for splenic masses: 539 cases (2001–2012). Journal of the American Veterinary Medical Association.
  13. Berg, J. 2014. Surgical treatment of pericardial diseases and cardiac neoplasms. Current Techniques in Small Animal Surgery, Fifth Edition.
  14. Schmidt, A.F., Nielen, M., Klungel, O.H., Hoes, A.W., de Boer, A., Groenwold, R.H.H., Kirpensteijn, J., Amsellem, P., Bacon, N., Berg, J., Kow, K., Kurzman, I., Maritato, K., Moore, A., Morello, E., Sottnik, J., Vail, D. 2013. Prognostic factors of early metastasis and mortality in dogs with appendicular osteosarcoma after receiving surgery: An individual patient data meta-analysis. Preventive Veterinary Medicine.
  15. Zacher, L.A., Berg, J., Shaw, S.P., Kudej, R.K. 2010. Association between outcome and changes in plasma lactate concentration during presurgical treatment in dogs with gastric dilatation-volvulus: 64 cases (2002-2008). Journal of the American Veterinary Medical Association.
  16. Kenney, E.M., Rozanski, E.A., Rush, J.E., Delaforcade-Buress, A.M., Berg, J.R., Silverstein, D.C., Montealegre, C.D., Ari Jutkowitz, L., Adamantos, S., Ovbey, D.H., Boysen, S.R., Shaw, S.P. 2010. Association between outcome and organ system dysfunction in dogs with sepsis: 114 cases (2003-2007). Journal of the American Veterinary Medical Association.
  17. Whelan, M.F., O'Toole, T.E., Carlson, K.R., Sutherland-Smith, J., Berg, J. 2007. Budd - Chiari-like syndrome in a dog with a chondrosarcoma of the thoracic wall. Journal of Veterinary Emergency and Critical Care.
  18. Zitz, I., Rozanski, E., Penninck, D., Berg, J. 2007. Managing dogs with thoracic impalement injuries: A review of nine cases. Veterinary Medicine.
  19. Ko, K.S., Backus, R.C., Berg, J.R., Lame, M.W., Rogers, Q.R. 2007. Differences in taurine synthesis rate among dogs relate to differences in their maintenance energy requirement. Journal of Nutrition.
  20. Wagner, A., MacGregor, J.M., Berg, J., Sharkey, L.C., Rush, J.E. 2006. Septic pericarditis in a Yorkshire Terrier. Journal of Veterinary Emergency and Critical Care.

General Research Interests

  • Surgical oncology

Selected Research Projects

  • Evaluation of a novel tumor imaging system for intraoperative assessment of the completeness of tumor excision

Research and Clinical Interests

  • Strategies for improving local control of surgically excised tumors
  • Canine osteosarcoma as a naturally occurring model for human osteosarcoma
  • Outcome following surgical excision of naturally occurring tumors of dogs and cats
  • Clinical veterinary soft tissue surgery and surgical oncology

Research Interests by Area

Spontaneous Animal Disease Models
  • Tumor excision in dogs and cats, wound management

Research Interests by Organ System and Disease

Cardiovascular Diseases and Nutrition
  • Surgical interventions in CV diseases
Oncology and Cancer Research and Clinical Trials
  • Canine osteosarcoma as a naturally occurring animal model for human osteosarcoma, technologies for improving local control of surgically-excised tumors. Oncology surgery; identification of surgical margins.

Major Specialized Equipment

  • MRI, CT, linear accelerator, surgical laser, laparoscopic and thoracoscopic equipment