Abstract
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 multiple integrative therapeutic protocols, and the frequency and potency of the medicines were changed every 60 - 90 days over a 20-month period, 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. Although multiple therapies were used throughout the treatment period, the consistent inclusion of Viscum album suggests a potential role for this therapy as part of the integrative approach. The results indicate a possible therapeutic benefit, especially when initiated early, although further controlled studies are required to confirm efficacy and safety.