My dog is weird, if I sneeze he doesn't react in any way, just carries on snoozing. If my DH sneezes he will leap up, even from a deep sleep, and be hyper alert and a bit scared for about 10 seconds. Then he'll realise that there's no danger and settle down again. Back when we had au pairs, the dog was lying under the table while we were eating and our au pair sneezed. The dog shot out from under the table and into his crate where he hid at the back. Admittedly the au pair is a big guy and it was a big sneeze, even I jumped a little, but the dog was genuinely very scared and wouldn't come out of his crate for ages.
I sneeze more often than DH but I don't think they sound significantly different to his. The dog is generally quite non-reactive to noise, they were letting off fireworks around here for Halloween and he barely flicked an ear at the noise.
Photo attached, because any excuse. 