Might sound daft, but have you thought of attaching lights to the dogs – maybe the sort joggers etc. use? A really poxy little lamp is visible from miles away, whereas my experience of looking for our dogs with a torch suggests it’s a bit needle in a haystack
I tried lights on the dog, but she shakes herself too much and broke them on a regular basis. She now wears a dog buff, complete with scotchlite over her house collar, and her harness has some smaller reflectives adorning it. Even with a really poxy LED torch they throw back enough light for me to keep tabs on her in the woods, and the torch is enough to scoop the poop.
For sheer out torching the neighbours though it is a D cell maglite. Only gripe is weight, and that it has blown a couple of bulbs in it’s time.