It's possible that your dog is experiencing a cough due to various reasons such as respiratory infections, allergies, heart disease, or even something stuck in their throat. If your dog is coughing persistently or showing other concerning symptoms such as difficulty breathing, lethargy, or loss of appetite, it's best to consult with a veterinarian for a proper diagnosis and treatment plan.
In the meantime, you can try to help your dog by keeping them calm and comfortable. Make sure they have access to fresh water and a quiet place to rest. Avoid exposing them to smoke, strong odors, or other potential irritants. If your dog's cough persists or worsens, do not hesitate to seek veterinary care for further evaluation and treatment.