If that "tiredness" when walking appears in your dog at old age, you have to consider rheumatism. It can be a real torture! The first thing you have to do is treat the pain with a pain suppressor. This is done by means of applying heat, in many different ways.Check the temperature of the room, at dog height (50 cm above the ground, more or less), because sometimes even in warm and cozy houses there is a draft. It is also recommendable for the dog to remain in movement as that keeps him warm.
Suggestion: Dogs do not react well to human rheumatism drugs. Ask your veterinarian for an appropriate one for .