I don't see anything wrong with it, as long as the dye or whatever you put on your animal isn't toxic. I think when Sassy was a puppy there was purple dye on her(only a little) for the breeder thing. My dad died a small stripe on her once, a red white and blue one for the 4th of July when we went to see my grandma in the nursing home. She really got a good laugh outta that.