I have the same problem with Ripley. When I let him out with Bella I can see her just fine but he blends in with the night. I had a collar in my hand at PetsMart just the other day that is supposed to be reflective. I was wondering how well it would work at a considerable distance. I have never heard of a flashing tag but would be interested to learn more. By the way, give that little sweetie a hug from me. I just love Sylvia.