It is interesting to hear all people's opinions. Groomers who competed in color grooming competitions received negative comments from the media last year. A groomer, Sandy Blackburn had to deal with negative comments because she dyed her poodles. Dawn Omboy aka Queen of Color does beautiful job on coloring her poodles. She uses bleaching (that you use for your hair) on black coat before coloring it. May be harsh on the coat but she doesn't let the chemical touch the skin. Many years ago, I dyed my poodle with kool aid & it worked very well. It took a while for her coat to return to original color. The groomers' dogs including my dog loved the extra attention from the people.
I understand that some dogs have sensitive skin & should consider carefully before doing anything to hair/skin. OP, have fun & post the picture if you dye your dog.