An uncommon intestinal protozoan parasite was implicated in three case
s of colitis in Pacific Northwest cats. Pentatrichomonas hominis was i
dentified in the stools of three Pixie-Bob cats in this preliminary re
port of an unusual disease syndrome. The purpose of this report is not
so much to champion P. hominis as a feline pathogen, as to alert othe
r practitioners to the existence of this atypical disease presentation
.