Canine distemper virus (CDV) is a highly contagious viral disease that primarily affects dogs and some other animals, such as foxes and raccoons. It is caused by a paramyxovirus and spreads through respiratory secretions, direct contact, or contaminated surfaces. Symptoms can include fever, coughing, nasal discharge, and gastrointestinal issues. Vaccination is the most effective way to prevent CDV, and it is typically included in routine puppy vaccinations. Early detection and supportive care are crucial for affected animals, as the disease can lead to severe complications, including neurological problems and death if left untreated.