Andrea, I'm with you and secretly worry about the safety of doing this.
: I know people pony their minis cross-country from golf carts, but golf carts don't have minds of their own and will stop the minute you take your foot off the pedal, no questions asked.
I always overthink things and when I took both my big horse Spyder and little Kody to the ocean this year I was coming up with all sorts of ways to try and make it safe to pony the mini from the big horse. I worried about Kody yanking me off Spyder, about Spyder trying to chase him away, about Kody going
under Spyder, etc. etc. etc. I was only going to do it from the saddle (not bareback like I usually ride), I was going to have two leadlines, one longer emergency line tied to the saddle horn and a short one that I held, and I was going to slide a PVC pole down the lead line so I could hold Kody off it he tried to cut in front of or go under Spyder. In the end, I told the person leading him in-hand "Oh, the heck with it," broke every one of my own rules, and ponied him. And ya know, nothing happened. LOL
But I drew the line at ponying the big horse from the mini cart because I felt the safety risks were far too real. If Spyder spooked while tied to the back of the cart, he had more than enough power to drag me, the cart, AND Kody off in whatever direction he felt like, probably permanently traumatizing my driving horse as well as injuring all of us. Even if I'd had a passenger to hold him, I would have been concerned about him catching his shins on the axle of my cart as it sticks out quite a ways on either side to allow for steel wheels.
So here's my thoughts related to ponying a MINI off a cart. I would want the non-pulling horse thoroughly trained to voice commands so they would respond to changes of speed without stress. (That's why ponying Kody off Spyder worked; Spyder worked off my legs and Kody off my voice!) If possible I would have a passenger hold the horse for the sake of safety. If it wasn't possible, I'd probably use a loose leadline on either edge of the seat back to center the horse so they couldn't come up by the wheels or get their nose down there. I might even put a small section of that aforementioned light PVC pipe on the lead to provide backwards pressure on his halter if he tried to put his head over the seat, just so that he couldn't nibble on my jacket when I needed both hands to control the driving horse. Heck, ideally I'd make sure
I knew how to drive one-handed so I could reach back and fix things! :lol:
For the horse being driven, I'd make sure they are either older or used to kids so no sound, tug, bump, or outright pull will startle them. Given my two horses I'd probably put the harnessed horse in an open bridle so he could see what was going on and not be startled or traumatized if something happened behind him. So many times when a horse is ruined in a cart accident it isn't what happened so much as that they couldn't see it coming that makes them terrified it will happen again. An open bridle would prevent that and may keep them calm long enough for you to fix things if something does go wrong. After all, why run away when you can see your buddy is behind you and you want to stop and stare at him throwing a tantrum anyway?
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Basically the smaller the horse I'm ponying is compared to the horse I'm driving, the happier I'd be about the safety risks. Ponying would be done best on straight-line distance drives to condition rather than during ring work where of course you are only going to confuse and annoy the ponied horse with transitions and turns and not give enough attention to the driven one's work. But basically, despite all my worries I think you are probably fine to tie one mini to the back of an easy entry cart and hack out as long as you are careful. As with the farm horses you mentioned, it's a great way to desensitize a youngster to the sound of a cart rattling along and all the sights and sounds they will encounter later. Just don't overstress a young horse who isn't ready for sustained work on hard surfaces.
Leia