My brother-in-law in Montana had a good big bull tag last year and took his 5 y/o nephew w/ him one day. My brother-in-law couldn't get any response and the kid wanted to try (& has played w/ the tube style bugle around the house) so he did and a good bull did respond, so he told the kid to keep doing it. They didn't get that bull, but I guess it was pretty cool.