Is your dog not running, playing, or lying around all day? Many owners think it's just plain laziness, but the truth is — it could be the first warning sign of a bigger health problem. Dogs are masters at hiding pain, so by the time you notice symptoms, the problem could be far advanced. Weakness could be caused by anemia, infection, heart problems, dehydration, or nutritional deficiencies. Taking your dog to the vet right away can save their life. In this post, you'll learn when to take it seriously, what foods can help your dog regain his energy, and what mistakes can make the problem worse. Your dog is a member of your family — his health is never a "wait and see" thing.