A. It may be a conformational thing, in other words the way he's put together. He might have a long soft palate (on the roof of his mouth) or slightly small nasal openings, and either of these things might cause him to make increased respiratory noises when he's breathing deeply.
As long as he's normal otherwise - eating/playing, urinating and defecating normally, not seeming out of breath or like he doesn't want to move, and not breathing abnormally when awake - I think you could mention this to your vet at the next visit. He can listen with a stethoscope to hear any abnormalities. He may recommend chest x-rays to see if there's anything unusual in his lungs.
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