Just a quick thought- my 4 ferts(Abbot,Costello,W.C. and Bozo) all had sneezing and coughing problems- turns out it was the litter I was using. I no longer use ANY type of clumping litter.As you know,our little friends like to root around in the litter box,especially when it is nice and fresh.That stuff not only clumps when it is wet;it also clumps in their lungs and digestive tracts. I quit using clumping litter and the sneezing and coughing stopped in a week or so. [Posted in FML issue 2211]