Sort the shade out before the heat arrives
Walk the whole farm on a sunny morning and stand in each field, pen and run at the hour the sun is strongest. Shade that looks generous in the morning can shrink to a strip along the fence by midday, and horses will crowd into whatever patch is left, churning the ground and stressing each other. Every group needs shade big enough for all of them to stand in at once without jostling — a mature tree, a field shelter with the open side away from the afternoon sun, or a shade sail stretched over the chicken run. If a paddock has no real shade, move that group before the heatwave rather than during it; animals already hot and bothered settle badly in a strange field.
Water becomes a twice-daily job
Drinking climbs steeply in hot weather, and a trough that lasted two days in spring can be emptied or turned green in one. Top up every trough morning and evening, scrub out algae before it taints the taste, and put a second bucket in the far corner of large fields so a horse low in the pecking order is not kept away from the only drink. Check automatic drinkers are actually flowing, not just connected. For poultry, add shallow extra dishes in the shade, refresh them with cool water through the day, and make sure chicks and smaller birds can reach the rim without climbing in.
Keep air moving and shift work to the cool hours
Stable blocks and coops trap heat fast. Open every door, window and vent you have, prop the ones that swing shut, and check the coop roof space is not acting like an oven over the roosts — extra ventilation high up lets hot air escape where the hens cannot feel a draught at perch level. Do the handling, moving, loading and riding in the early morning or evening, and let animals rest undisturbed through the fiercest part of the day. Flies multiply in heat and torment everything standing, so keep muck heaps away from stables, clear droppings from small pens daily, and hang traps where they draw flies away from feed and water rather than towards them.
Know the signs of an animal in trouble
Most healthy animals manage heat if shade and water are right, but check the vulnerable ones — the old, the very young, the overweight and anything already unwell — at midday as well as morning and night. Hens panting with wings held away from the body, goats breathing fast and lying apart from the flock, and horses that are sweating heavily, off their feed or, more worryingly, have stopped sweating on a hot day all need help: move them gently to shade, offer water, and hose a horse's legs and large veins with cool water. An animal that is staggering, breathing hard while standing still, or unresponsive is an emergency — call the vet straight away, because heatstroke can kill faster than most people expect.
None of this works if it depends on one person remembering everything, so put the heatwave rounds into KinsLe's Care Teams — trough checks, coop ventilation, the midday once-over of the old pony — each job with a name against it and a timestamp when it is done, so the whole farm stays covered even when you are off the yard.