Over the last couple of days I had noticed this terrible smell in the apartment that was actually coming from the litter box. I thought that maybe the litter was just dirty (we use the clumping kind) so I changed the litter. However, Bubba went to use the litter pan and the smell was back, I guess it is in the urine. I have never had this happen before, and it is smelling up the whole appartment. He is acting normal, eating normal, so I am puzzled. I thought maybe an infection, any ideas???