Originally posted by aly
If my groomer is going to be human and make a mistake, the responsible thing to do would be to tell me about it so I don't have to go home and discover the marks myself. That is shady business. It has only happened twice so I'm sure it isn't sensitive skin or anything.
Just letting you know that sometimes things like that (red marks) don't show up like the second it happens. They may have not even seen anything like that when they finished him and therefore didn't tell you about it because they didn't know about it. I groomed Sydney one time and noticed a red mark on the inside of her leg the next day, I never saw it when I groomed her. The blade wasn't hot and I was being careful, accidents do happen.

And to answer the original question, working as I groomer I definitely encourage tipping of course. The few tips I receive are greatly appreciated. Work as a groomer for a week and you'll want to tip them generously.