Opportunities and challenges of active immunotherapy in dogs with B-cell lymphoma: a 5-year experience in two veterinary oncology centers ========================================================================================================================================= * Laura Marconato * Luca Aresu * Damiano Stefanello * Stefano Comazzi * Valeria Martini * Roberta Ferrari * Fulvio Riondato * Nicole Rouquet * Patrick Frayssinet * Silvia Sabattini