2. You dog has difficulty breathing and limited stamina
Dogs who are having consistent trouble breathing, or dogs who become tired quickly and after very little physical exertion, may be obese.
Excessive panting is a related sign, one that indicates that your dog is having difficulty getting fresh, oxygenated blood to his vital systems. Cardiovascular and respiratory disorders are common in obese dogs.
Over time, complications from long-term obesity result in conditions such as congestive heart failure.