I've always seem grooming in the way that I do normal hair cutting (except its a lot more difficult!) 20% is my minimum, as long as its been a good job. If its sub-par I generally leave a lot less, usually just a few dollars to nothing at all if its nothing like I asked. If they did a good job I try to always leave as much as I can, since I have always been one to believe that if you treat them well they will treat you well back.
Its served me pretty well. Grooming is a tough job, so I always like to reward the groomers who really make the effort to come out with a good product. |