Here's our latest night-light doggie harness creation, and I really like how bright and super-visible it is. You can see it across a football field.
The lights are these $10 clip-ons: http://www.amazon.com/Nathan-Strobe-.../dp/B0099LSWYM
Buddy has 3 of these Nathan Strobe lights clipped onto his Hug-A-Dog harness, and Lizzy has only 2 lights cuz her harness is smaller. We sewed little loops onto the harness, for the clips to grab onto. That way they never let go, even if Buddy rolls into smelly stuff.
Details:
Buddy's harness has thicker edges, so we needed to sew 3 loops so that the light's clip would completely close.
Lizzy's harness has thinner straps, so no need for sewing extra loops: