Solo travel is its own lesson
For a horse with separation anxiety, the event is rarely the whole problem — the trouble starts at the ramp, because travelling alone has only ever meant being taken away from his friends for an entire demanding day. Unpicking that means teaching solo travel as a skill in its own right, on days when nothing else is asked. A horse can learn that the trailer sometimes means a short trip and home again, that being the only horse in the box is survivable and even dull, and that you are a constant feature of the whole arrangement. Until those lessons are in, every event asks two hard questions at once, and he will usually fail the travelling one before he reaches the competition one.
Build the ladder at home
Load him, close the partitions, and feed him his hay net standing in the stationary box. Next stage, a five-minute drive and home. Then a trip to a quiet venue where he unloads, grazes in hand, reloads and comes home without competing at all. Vary who is left behind, and sometimes leave him at home while a companion goes out, because being the one left and being the one taken are different anxieties and events will test the travelling one harder if the home one is also raw. Each stage should be repeated until it produces a yawn. Rushing the ladder because the event is on Saturday is how horses end up scrambling in the box on the motorway.
Make the box familiar and boring
The inside of the trailer should smell and feel like home: his own hay net filled from his usual bale, bedding from his stable on the floor, his familiar rug on if he wears one. Keep the routine around loading identical every time — same order of boots, same ramp routine, same calm voice — because predictability is an anxiolytic for horses. Travel at quieter times of day while he is learning, avoid long waits standing in a hot box before departure, and drive like you have a full cup of tea on the dashboard; a horse fighting for balance cannot simultaneously relax about being alone.
An event-day routine that lowers the temperature
Arrive with proper time in hand, because your hurry will become his alarm within minutes. Park where he can see other horses — not necessarily beside them, but within sight, so the showground reads as a herd that happens to be scattered rather than an exile. Unload, let him graze in hand and take the place in, and keep everything you control in its home order: same bucket, same water offered little and often, same warm-up sequence he knows from schooling at home. Between classes, stay his social anchor — graze him, stand with him, or stable him where horses are visible — rather than tying him alone to an empty box facing a hedge.
Read the escalation honestly
Sweating up in the box, scrambling against the partition, constant calling that does not settle once he is unloaded, and refusing to stand tied are a horse telling you the step was too big, not a horse being awkward. The right response is to go home, drop the ladder back a rung, and rebuild — pushing through an event on top of travel panic tends to weld the two together permanently. A horse who injures himself in the box, or whose anxiety is severe enough that travel is genuinely unsafe, needs a vet involved in the plan before the next trip. A simple record keeps the ladder honest: note each solo trip in KinsLe's Care Teams as you do it, and what he has already coped with is there in black and white when the next event comes round.