Treatment of a Grade II Mast Cell Tumor in a Young Dog Using Injectable Viscum album Therapy

Mast cell tumor (MCT) is a common skin neoplasm in dogs, and its conventional treatment may include surgery, chemotherapy, and radiotherapy. This study presents a case of a grade II MCT in a young dog treated with injectable homeopathic Viscum album. The diagnosis was confirmed by histopathological examination in December 2022, and immunohistochemistry was performed in March 2023. The patient was treated with different protocols, and the frequency and potency of the medicines were changed every 60 – 90 days for 20 months, with no adverse effects observed. A follow-up biopsy performed in January 2025 revealed the absence of tumor cells at the site of the initial incision, indicating complete tumor regression. Previously, the initial biopsy had shown that the tumor had compromised both lateral and deep margins. The results suggest that Viscum album may be an effective and safe therapeutic alternative to treat MCT in dogs, especially when initiated early, with the potential to reduce tumor recurrence and improve patient survival.