I have a friend, not super close but we share a hobby, see each other once a month on average.
She asked me recently if I could look after her dog for a couple of nights; she'd messed up some dates for boarding him and would have to cancel plans if I couldn't look after him. I said yes (her dog is easy to care for).
This was a couple of weeks ago - it was fine, dog was very happy, but I admit I am a bit surprised that she didn't offer anything like a bottle of wine, or chocs, or even a card to say thank you.
My DH thinks I'm unreasonable as you shouldn't expect anything from friends, that you do favours and that's that. It's not that I expected it, but in her place I would 100% have bought something to say thank you.
I feel a little differently about her now - just a bit used, but hopefully I'm being daft so please tell me if I am!