This mouse monoclonal antibody provides highly specific detection of Canine Coronavirus (CCoV) antigens, supporting sensitive measurement in ELISA, Western blotting, and antigen‑capture assays. Clone 4A9 recognizes a defined viral epitope, enabling precise detection in complex canine samples with minimal background. Its strong affinity and clean signal make it suitable for diagnostic assay development, surveillance studies, and research on coronavirus infection dynamics in dogs. MCCV‑40A‑4A9 delivers consistent lot‑to‑lot performance, ensuring reliable antigen detection across repeated assays and diverse sample types.