Dogs have thyroid gland problems, just as people do. Too low, too high, both happen and produce just about opposite signs in affected dogs.
Overweight, inactive, poor hair and skin condition, are commonly seen when the thyroid doesn't produce enough hormone. The opposite, or too much thyroid hormone, commonly results in an active dog that has lost weight, in spite of eating 'well', and seems healthy otherwise. Take him to the vet, with a sample of his BM for a worm test, and explain your concerns to the vet. There is nothing to gain in trying all sorts of different diets to get weight on him until you determine there isn't a medical problem.
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