In recent days, I've been working on training Marshall to "touch" Bo. Having no children of my own, Bo (my other dog) is the only other moving target I could think of. But initially I had to keep Bo on a leash to keep him in range.
It still takes a little while for Marshall to remember what I'm asking, but once he gets it, he has the "touch Bo" down. (He'll tap Bo on his side with his nose). Now I'm trying to increase the distance and add then hope to add "search" . It's only been just two days, so I'm early in the process.