How can I dye my dog pink with food coloring?

I don't want to use human hair dye because it's dangerous to dogs. My dog has these white patches on her and it would look adorable. If they where pink. Plus I'm bored. I want something easy to wash out though. What should I use? Oh and none of the How could you be so mean blah blah blah. Or dogs aren't ornaments. I do CARE for my dog and she is happy and healthy thank you. She doesn't care if her fur is pink!