Dog having breathing issues attacks?

I have a 2.5 year old chiwawa dachshund mix *****. (lol, apparently I can't use the "b" word to describe my female dog!) Every now and then she has these little breathing issue attacks, they generally only last about 5-10 minutes, and then she's fine. But during them, she's miserable. What she does while it's happening is inhale deeply in little bursts through her nose. It almost seems like she's got mucus clogging up her air passage, and is trying to clear it. She doesn't move around much when it's happening, and wants to hide under the coffee table when it happens.

Last night she woke me up with one of her attacks, it seemed to last longer than usual, and seemed more intense than usual.

I thought it might be asthma, but everything I read says dogs with asthma will cough, not inhale.

Anyone have an idea what might be wrong? Should I be concerned?