Dogs nose clicks?

so shes just lyin on my bed right now and when she breathes, theres a click. is this just and allergy, or something else? and also somthings worrying me; i went to go put her in her crate because we had to go sumwhere for a couple hours and i locked her up but when i started to go down the stairs, she started exhaling theese shorts puffs over and over, first i thought she was sneezing, but i know when she sneezes. so i went to see what was wrong then she stopped, i go down again and she does it again. is this just a weird sneeze and shes just getting allergies?