Absolutely dogs do sneeze - evn the bunny sneezes when she's been in a really dusty place, which is funny because I would think that rabbits being generally underground den-makers, I wouldn't think dust would bother her like it does me!

If it's just a few sneezies, I wouldn't worry too much, but dogs allergies often take the form of itchiness.

Simba-luv isn't a smush-faced dog, like a bulldog of a pug that might be expected to have chronic breathing problems, so like I said, if it's just a few sneezies now and then, I wouldn't worry too much!