I noticed that my cat's nose gets wet from time to time. I called the vet and he told me that I should observe the cat's activities: whether it starts being miserable, whether it eats less, etc. None of them happens.
Every night when my girlfriend and I go to bed, my cat lies between us for a while, always purring. And her nose always gets wet. So, I realized that my cat's nose basically just gets wet when she purrs. All the rest of the day, it seems to be dry.
None of her activities have changed; the only change I can think of is that recently she has started sleeping longer hours, but that could be caused by her age as she's not as young as she was (2 years and a half now).
Why does her nose get wet when purring? Should this be something to worry about?