I have had greyhounds and lurchers, and every one of them does it. It's not a full sneeze, I call it a "snit" because that's what it sounds like. They're large

I have had greyhounds and lurchers, and every one of them does it. It's not a full sneeze, I call it a "snit" because that's what it sounds like. They're large dogs, so when they're being playful, jumping around and play fighting, we sometimes tell them "no!" is they're about to knock something over. This always gets us a "snit". The yawn thing that someone else mentioned is also common. If they are displeased with you, you get a yawn. Like if you ask them to do something (sit, paw etc) too many times and they're bored of you, you'll get an exaggerated vocal yawn. And the last one I'll mention, because it's so common in all dogs I've seen, is the shake. Directly after a tense situation, they shake, like they do when they're drying themselves. For example, if you're walking your dog and they encounter another dog that is larger, or a breed that they don't know or don't trust, they'll sometimes do a quick shake a few seconds after the encounter. I always reward the shake with a treat, to tell them "good dog, you kept your shit together in a stressful situation". A trainer told me to do that when I had a grey who had very bad social anxiety, and it really worked.