I don’t think its will be cool to dye a dog hair. It will look funny.But some of people do this for their dog.Last week when i walking on a lake then i saw a lady with her dog and the dog hair got pink hair dying.
This was so funny.But if you think you really want to do dye your dog's hair you can do it. Search on the wiki for information and processing of go to do your dog
hair dye.