I recently watched a dog for a week in my house. He's a lovely dog and I was happy to do this.
I met the owners on a dog-borrowing website, and we borrow him pretty frequently.
Watching him for a week, as opposed to having him for a day, was a different kettle of fish entirely (he is still a puppy and pretty needy, started peeing nad pooing in the basement). I was pretty happy to hand him back at the end.
I don't particularly need a gift, but is it not cheeky that they didn't write a thank you note, bring me a bottle of wine, something like this - for watching their dog for free for a week? I normally bring my neighbour something like flowers or wine if I ask her to look after my house for a week and she takes in a package. I just got another text asking when I wanted to borrow him again.
They sent me a text the day before they returned saying thanks very much for watching him, hope he's been OK. I didn't see them upon drop-off, they left me with a key and I dropped him back.