Why is my dog tired and weak all of the sudden?

He's usually constantly barking and playing and running around but suddenly he's lazy and barely has enough energy to go for a walk. This happened literally over night. He's a healthy weight and he's 4 years old. What could be wrong?

    Why is my dog tired and weak all of the sudden?

    He's usually constantly barking and playing and running around but suddenly he's lazy and barely has enough energy to go for a walk. This happened literally over night. He's a healthy weight and he's 4 years old. What could be wrong?...
    Dogs Training Discussions : Why is my dog tired and weak all of the sudden?...

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    • Why is my dog tired and weak all of the sudden?

      Why is my dog tired and weak all of the sudden? Dogs Training Discussions
      He's usually constantly barking and playing and running around but suddenly he's lazy and barely has enough energy to go for a walk. This happened literally over night. He's a healthy weight and he's 4 years old. What could be wrong?

      Why is my dog tired and weak all of the sudden?

      Why is my dog tired and weak all of the sudden? Dogs Training Discussions