I bought Dillon a Ruffcoat "lab coat" that lights up. It has a battery pack, and it has two stripes of bright blue light that go down the sides, he can be seen for 500 yrs...
here is a photo of the product:
Ruff Wear Lighted Lab Coat - FREE Shipping - ALTREC.COM
where you see the small reflective stipes, that is what you turn on at night ( has a tiny battery pack on the top) and it lights up solid or you can have it blink... pretty cool...
Emilie