Our little cat, 2 years old, keeps washing people's hands. It is a recent thing but a bit freaky, everyone someone sits down she is up next to them, the reach to stroke her, get a little gentle nip (to taste?!) and the she washes them to the wrist if allowed.
She is spayed (4 months ago) is a bit thin (has been wormed, flee'd, jabbed etc) and is eating and drinking well. I am still concerned it is her kidneys, she certainly doesn't like her sides being stroked.
Am I paranoid?