This would have worked really great when I raised our guide dog pup.
He was a black Lab and I live way out in the country, and moonless nights are DARK.
For the first weeks after he arrived, when I’d take him out to do his business at night, I could not see him at all and would be bending down to try to see his outline against the pale siding of our house, so I could tell when he was going.
hoot
Black dogs are best. The first thing an intruder sees is teeth. ;)