Trot. When a horse trots, its head stays level unless it has a limp in the front end. When the horse has a limp in the back end one of its hind quarters drops. If it is sound then they are level. When a horse is galloping it has a 'leading leg' - its two sides do not have the same movements so it is difficult to spot a limp.
you make it trot
I think you make it gallop, trot, or jump.
Have the horse trot for you!
The horse needs to walk.
At least walking.
No; in fact, that could only worsen things exponentially. If a limp is not visible (even slightly) when the horse is walking, he's trotted in hand. It should show up then if it's there.
Jump from a high place
make it walk or trot
limp bizkit
Abscesses impede the horse's ability to walk normally. Abscesses are very painful, so horses will limp and will not run when they are in pain. However if the horse is given bute (a pain killer), the horse won't limp as much.
DJ lethal
The first signs you might see is if a horse is holding its front foot off the ground (resting a back leg is normal however) or limping noticeably when it walks. You should call the vet. He will probably ask you to lead the horse at a trot away from him and then towards him. The horse's head will nod when the good leg hits the ground and jerk up when the bad leg comes down. If the limp is in a hindleg, the hindquarter of the other leg will also drop when that foot hits the ground.