For years I have joked that I bought the equivalent of an oversized dog because I bought a yearling even though I could only afford one horse at a time. While he was young I still wanted to spend lots of time at the barn so I spent a lot of time grooming him, taking him for walks etc. but staying very mindful that he still respected my space and maintained his manners as I have met many trainers that prefer starting unhandled youngsters as compared to overhandled ones.
He is now 4 years old and well started undersaddle, and was the easiest horse I have ever started so between lots of handling and a great mind all worked out well. Lately however I have noticed that he consistently comes when called, follows me along the fence line when I am walking my dogs (they have a healthy respect for horses and stay out of the field), and that he is extremely curious about the game of fetch. Yesterday I was patting my gelding and my dog brought up a large stick he found (normally I play fetch with balls and soft toys), before I could intervene my gelding had picked up the one side of the stick and my dog grabbed the other side and they were having their own little game of tug-o-war across the fence. Normally I would have immediately intervened and stopped the situation but knowing how both behave (dog plays tug-o-war by holding the toy and letting the other dogs pull on it while he stays put, my gelding is going through a phase where he will pick up anything he can get his mouth on if you aren’t watching, holds it for a while and then gets bored and spits it out so neither has a tendency to be overly physical) I figured I would let them be and continue standing about a foot away if needed (if either showed any inclination to really tug on the stick I would have immediately intervened). After a couple of minutes my gelding let the stick go and my pup proudly bounded off with the stick.
Since that occasion my gelding is even more interested in games of fetch and will eagerly watch the entire game. My dog has learned a lesson from that and has figured out to drop the ball or stick out of reach of my gelding so that he doesn’t wind up in a second tug-o-war situation.