I think they do remeber because I've seen it with Jazz. When I got her from the shelter almost a year ago she was about 3 months old and was extremely sick. She had an URI, ringworm, tapeworms and earmites. I took her to the vet and started what ended up a three + week treatment and quarantine for her in my guest room. Even though it's been almost a year she remembers that guest room and doesn't like to go in there very much. She will sometimes follow Ripley in when he goes to nap on the bed but she quickly runs out. I know she remembers having to stay in there for several weeks and having lots of medication given to her, bless her little heart.

Jazzcat