Jenn,
You could try colored sidewalk chalk. When my daughter was little we had a westie (white dog) and one day she came in from coloring with side walk chalk on the back patio and said, "Look Mommmy, doesn't Scruffy look pretty?" I just had to laugh, she had colored the poor dog with sidewalk chalk. He was multicolored!! So funny! I should have taken pictures. But it came out just fine with a bath. I am not sure if it will show up very well with a blue and tan dog, but it's worth a try and definitely won't be permanent!
Good luck, let us know what you end up using.
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Little Bit |