Hmmm.. I would tip if I took Nicki in (no need for a short haired shedder )

Think about everyone you tip in normal circumstances:
~Waitress/waiter - regardless of whether or not you got your meal exactly the way you wanted it, or if the meal was overpriced. You might tip less than if you thoroughly enjoyed the meal, but you still tip.

~Car wash. Even if its a buck, I always slip the guy drying off my car something. Basically... what did they do? Just stood there with somewhat dry towels and dried me off - and I've never been thrilled with how its been dried, but courtesy is courtesy. Especially since these guys make nothing as a base salary, and depend on tips.

~Hairdresser: Silly thing, many women don't bat an eyelash to pay $80 for a day at the salon, then drop a $20 tip afterwards, but when it comes to the same thing for their dog they won't tip because the grooming services cost too much? I would think its harder to do dog hair than human hair. You tell a human to tilt their head up to the left, and the do it. Tell a dog? Good luck!

I could go on, but I'm not being too creative right now. What I'm basically trying to point out is we tip because its common to tip for other services. Why then should be wonder whether or not to tip the groomer? I can only imagine how tough they have it.