Rhinitis refers to the inflammation of an animal's nose; sinusitis, meanwhile, refers to the inflammation of the nasal passages. Both medical conditions can cause a nasal discharge to develop. It is important for your veterinarian to identify the cause of the nasal discharge (parasites, viral infections, bacterial infections, allergy, inflammatory, Foreign bodies, cancer) and treat appropriately. Supportive nutritional therapy while your pet is being treated for this disease is important . We recommend canine/feline immune support, Pneumotrophin for respiratory support and Fen-Gre to thin secretions and promote drainage.