It's a very good question, one which the fae has absolutely not answer to. It upkeeps the winning smile, gives a little bit of a shrug. Is that the dog? it wonders, Or is that something else?

Make up something generic, she'll never know.

"Oh, you know, bit tired and not fond of the cold. Thought I'd just take a walk myself." Now, change the subject before she can question that. "You look well!"

This may be accompanied by a slightly leering smile, which implies that well may also mean pretty.