When they are over-horsed under-saddle? A slight child/audlt might manage to ride a horse well and it may be massive so I don't know. Only when they can't cope with it physically.
Tempted to show you a pic of me riding a 17.2hh percheron (think thats what it was)! Way too big, but so fun!
I would say as long as you are able to ride it, in the situation required (ie hold it together for dressage, or controlling it out hacking) then its not too big! Even for all 5"2 of me.
when they dont have adiquate control of the horse, so less to do with size and more to do with skill. that said i wouldnt put an 8 yearold kid on a 16hh horse as they wouldnt have the size needed to have even a mediocum of control.
When they can't comfortably control the horse. My ideal sized horse is around 16hh but I've ridden bigger ones no problem. The biggest I've ridden is a couple of 17.2hh heavyweight hunters, and though I could control them, they were too big for me to do so easily and comfortably, so I would say they were too big for me really.
I would say my share horse is a bit big for me at 17hh (and quite chunky to boot!), but I can control him properly and make him work correctly. Its just if I was buying one it would be closer to 16hh than 17hh!
Thats not necessarily true. I learnt to ride at a dressage yard in germany and was often put on horses this size at a very young age. That said they were super schoolmasters who never put a foot wrong - i guess its just the way things are done out there!
When their feet don't go past the saddle flap ends.
When they get altitude sickness after a lengthy hack.
When the ground looks blurry.
When the paces feel as though slow motion.
When you are tempted to rise and sit twice for every trot stride.
When jumps that looked enormous and scary when you were on the ground, suddenly look small and inviting when mounted.
When the police force show an interest.
When you can't buy rugs that fit without a special order.
S
I think if you are going to buy a horse you should be able to get on it from the ground if you need to. You never know when you might have to get off on a hack and there is not always some thing to get on from.
Large horses can be extremely well schooled and thus suitable for any rider who can give the aids. A small horse can often be a safer mount for a child than a pony.
On the other hand you can get some lumbering heavyweight that can hardly feel the 8 stone girl on top and takes no notice whatsoever.
[ QUOTE ]
When their feet don't go past the saddle flap ends.
When they get altitude sickness after a lengthy hack.
When the ground looks blurry.
When the paces feel as though slow motion.
When you are tempted to rise and sit twice for every trot stride.
When jumps that looked enormous and scary when you were on the ground, suddenly look small and inviting when mounted.
When the police force show an interest.
When you can't buy rugs that fit without a special order.
S
when the horse ignores the rider. this is a matter of schooling, not size. i've had a child riding my 18hh + warmblood, and he behaved impeccably, even though she looked like a pea on a piano!
When they have no control of the horse they are riding, and the horse is choosing what they wish too do, a small child can be fine on a HUGE horse is its well schooled enough for example
(this is pickle with one of the kids from the yard please beware he is a seriously trustworthy schoolmaster she trotted/cantered him happily)
..too big when they can't cope - but then again lots of right sized people can't cope on "right" sized horses. Therefore a horse can only too big when you can't get on it from a)mounting block b)fence c)step ladders.....
People say mine is too big - 16.2hh - and I'm 5'3". but she's very trustworthy and well-schooled, and no problem. It's a long way down though. I can't mount from the ground and it's difficult to do gates. But she's a sweetheart and I wouldn't change her.