They're sweet, flaky little assholes and delights, but their breeding standards leave them prone to blindness, asthma and weight gain.
But on the other hand, corgi's tiny nubbly little legs and average body leads to joint and spine problems, and also weight gain issues. Weight tends to be common with all dogs, because they don't understand that they must eat all the food as soon as it's an option. Either way, the best course is to support less stringent breeding standards and mutts.
That being said, pugs and corgis should not be bred together. Solves a couple problems, grants the rest of the problems in exchange for less blindness and joint issues due to nub-legs, and made completely hideous.