I was away for a week stalking so did not join the fun in the now suspended discussion about yellow collars and such like.
I go even further.
My hound has an elastic Bodoband with her name, address and a phone number. As she is now 7+ I quite often track with her without a lead. By putting on this band she knows there is tracking to be done.
In the late evening I add not only a collar that lights up because I could not see that if the grass/corn is too high but I clipp onto that a small strobe light.
This enables me to see the hound when she is 100 yards in front of me in tall grass.
It does not detract the hound in any way from her job.
Once she has found the deer I put the strobe light on top of it thus making it very easy for anybody to know where it is for collection.
What do other people do?