So...

I've had rabbits as a house pet consistently since 1992.
In all that time, I have NEVER had to hire a pet sitter.
I've left them on their own for a weekend, had friends house sit while we were gone, I've taken the rabbit(s) with us on our trip, I've had a neighbor's kid watch them, or I've sent them off to a friend who fosters with a local rescue group (cost: volunteer work at some future time).
But now my guy is elderly (11 - which is ancient for a rabbit), and he's more than a little set in his ways. He makes it plain that he does not like to be uprooted from his home and carted off to live in a stranger's house for a week or long weekend with a bunch of other stinkin' rabbits (as much as we try to tell him that "Camping with Aunt Susan is FUN!" - he doesn't buy it any more! ).
So a neighbor and friend has started a dog-walking/pet-sitting service. We intend to have her watch and feed our rabbit, Noah, twice a day while we're gone. Cost is "per visit", in the neighborhood of $10-15 each. I guess a small price to pay for nearly 20 years of pet ownership.
But....after all is said and done....should I tip her? Throw in an extra $10 or something for a job well-done (presuming, it IS well done??)?
Thoughts? Is tipping a normal thing? I don't know the etiquette here.
Thanks.