An Infestation of Blue
ShortStory 4,356 words Recommended by 4 award/anthology sources
"The first thing she knew was that smells didn’t have the same shapes or colors anymore. Not wrong, exactly, but different. Even her own scents—rawhide and dirty paws and bits of grass that had brushed her belly—were changed, not just undercut with the stench of iodine and other humansick smells, but made new."
Quasar links out; the story lives on Analog, where the author gets the click.