Final answer:
The two most common clinical signs of congestive heart disease in dogs are coughing and difficulty breathing.
Step-by-step explanation:
The two most common clinical signs of congestive heart disease in dogs are coughing and difficulty breathing.
Coughing is often seen due to fluid accumulation in the lungs, which can result from an enlarged heart that is unable to pump blood effectively. The cough may be dry or productive, with the dog bringing up white foamy phlegm.
Difficulty breathing, also known as dyspnea, can occur due to the buildup of fluid in the lungs or around the heart. This can make it challenging for the dog to get enough oxygen, leading to labored breathing.