My mice sneeze too! but mine do it like its part of their little language. I too have just started a colony, one fancy boy and 3 fancy girls. Once I show my boyfriend that having mice in our house is a good thing I can get more. All my extras are going to be frozen or treats for the snakies at my old highschool. Yeah... any way all my mice sneeze... its weird cause you can here them nickering to each other. One of my females, Gaia, talks! when you hold her for a while she starts to talk its really cute. a sort of nicker squeak language. She is the coolest mouse besides my male Uranus they are both heart breakers. so i guess what your supposed to get out of this is that your mice seem pretty normal to me... but i guess thats cause mine sneeze too.... I hope they are alright! Well I guess we are in the same boat. I hope everything turns out ok... for the sake of our precious snakies