My Siamese cat Oliver also has the stinkiest poos you have ever encountered. He has two boxes in the computer room and you can not stand to walk past the door if he has pooed even if the door is closed! He has been wormed for both tapes and other common worms. I wrote on another thread about his awful stinky, mushy poos and someone said he could have another type of parasite. He has an appt to be neutered next Weds 1/19 and I will ask the vet about the possibility of Coccidia or Giardia. He also has the most awful breath. Anyone else have a younger cat with Horrible Breath? If the two aren't related, does anyone have any suggestions? I have checked his teeth and they are pearly white and he only gets dry food. I am also having trouble with this guy pooing on the rug in front of his litter boxes even though I cleaned them out every other day. I am now trying to clean them several times a day and still have problems with him messing on the rug in front of them.