That was super cute! My 2 girls grew up with a yellow lab, who also put up with a lot! They had a red wagon and played horse wagon with it. Lab was the horse, and somehow they wanted her to pull both of them in the wagon... (didn't happen). When the girls rode one of our horses (double riding), the lab would dutifully follow them all over to make sure they were OK. Girls were only 6 and 4 then, but between the saint paso fino mare and the watching lab, they managed to stay out of trouble and on the horse.
Brings back wonderful memories - girls are now both in college.
"Another member of the Barefoot Eventers Clique"