Scooby Doo is "right on" ... buns can developrespiratory illnesses. Some diseases like the one she mentioned can laydomant (until something tiggers it ... sometimes something as small asa temperature change). I lost my first bun, Bugs to that disease ...not a pretty picture. He developed "wry neck." This condition causestheir head to twist to one side or the other and they loose theirbalance, causing them to fall over alot. Not trying to scare you ...just wanted you to take your bun's sneezing seriously. I now haveanother bun that I adopted, Harley. I take him to our vet every year onhis birthday for a check-up and blood work. I guess I'm overlyattentive after loosing Bugs.
Even if your bun is ill ... this disease can be kept under control. Myfriend in N.Y. adopted a bun that had a severe case and through herbalmedicines he has maintained her health for a number of years.
I'm not sure if buns develop allergies or not. I know they can't get colds or the flu like us humans ... thank God.