A shivering horse needs help retaining and generating body heat, and the fastest way to start is by getting the horse dry, sheltered from wind, and covered with the right material. Shivering is the body’s emergency heating system: rapid, repetitive muscle contractions that burn energy to produce warmth. It works, but it’s exhausting and unsustainable, so your goal is to support that heat production while reducing the cold exposure that’s triggering it.
Get the Horse Dry First
If your horse is wet, whether from rain, sweat, or snow, drying comes before blanketing. Moisture against the skin pulls heat away from the body far faster than cold air alone. Use a highly absorbent cloth or towel to rub down the wettest areas: the saddle and girth region, ears, flanks, and chest. Wring out the cloth when it’s saturated and keep going. Microfiber towels work especially well because they hold many times their weight in moisture.
Once you’ve removed the worst of the surface water, apply a wool or polar fleece cooler. Both materials wick remaining moisture away from the coat while creating an insulating air space next to the skin. Wool wicks slightly better than polar fleece, but fleece is easier to care for and works well in most conditions. High-tech synthetic wicking coolers are also effective. The one material to avoid is cotton. Cotton holds moisture against the skin and creates a clammy layer that slows warming.
A common mistake is skipping the cooler and throwing a turnout sheet directly on a damp horse. Without a wicking layer underneath, the sheet sits flat against the coat, eliminates that air space, and traps moisture rather than pulling it away. The exception is breathable turnout sheets with mesh linings specifically designed to create air space for wicking.
Layer Blankets to Trap Heat
Once the horse is dry or has a wicking cooler in place, you can add insulation. Layering two lighter blankets is actually warmer than one heavy blanket of the same total weight, because the trapped air between layers acts as additional insulation. Think of it the same way you’d layer your own clothing in winter.
Place the smallest, most fitted layer closest to the horse’s body. This prevents bulk from restricting movement and reduces rubbing. If both layers fit similarly, put the lighter one underneath and the heavier one on top to hold everything in place. For a horse staying indoors, a quilted stable blanket over a fleece cooler is a solid combination. If the horse will be outside, the outer layer must be waterproof and breathable. Never layer a non-waterproof blanket under a waterproof turnout and send the horse into rain or snow. The inner blanket will absorb moisture that can’t escape through the outer shell, trapping cold dampness against the body and making things worse.
Feed Hay for Internal Heat
Blanketing addresses heat loss from the outside. Forage addresses it from the inside. When a horse digests hay or grass, bacteria in the hindgut ferment the fiber, and that fermentation process generates substantial internal heat. It’s essentially a built-in furnace fueled by long-stem forage.
This is why hay is more effective than grain for warming a cold horse. Corn and other concentrates provide calories, but it’s the fiber fermentation that produces the most thermal energy. Offering extra hay to a shivering horse gives the digestive system fuel to ramp up that heat production. Free-choice hay during cold snaps is one of the simplest and most effective strategies for keeping horses warm overnight.
Provide Shelter and Good Bedding
Wind and wet ground are two of the biggest drivers of heat loss. Moving a shivering horse into a stall or three-sided shelter cuts wind exposure immediately. If you’re using a barn, make sure it stays ventilated. A tightly sealed barn traps ammonia and moisture from manure and breath, which creates respiratory problems. Healthy barns need four to eight complete air exchanges per hour, achieved through ventilated soffits, ridge vents, open windows placed across from each other, and doorways that allow airflow. The goal is to block direct wind on the horse while still letting fresh air circulate through the building.
Insulating the roof and walls helps maintain a more stable temperature inside. Deep, dry bedding (straw is a particularly good insulator) gives the horse a warm surface to stand and lie on, reducing heat loss through the hooves and body when the horse rests. A thick straw bed also traps a layer of warm air within it, much like blanket layering works on the horse’s back.
Offer Warm Water
Horses drink less when water is ice-cold, and dehydration compounds the stress of being chilled. Offering lukewarm water (not hot) encourages drinking and avoids forcing the body to spend energy warming frigid water internally. Keeping water buckets or troughs at a moderate temperature during cold weather is a small step that adds up, especially for a horse already burning through energy reserves by shivering.
When Shivering Signals Something Serious
Most shivering in horses is a normal cold response that resolves once the horse is dry, sheltered, and blanketed. But prolonged or severe shivering, especially combined with lethargy, a very cold ear or limb temperature, stumbling, or a rectal temperature below 99°F (the normal range is roughly 99 to 101.5°F), can indicate true hypothermia.
Hypothermia requires careful handling. Rapid rewarming can cause a dangerous drop in blood pressure, circulatory shock, and in extreme cases organ failure. This happens because blood vessels in cold extremities are constricted; warming them too fast causes sudden dilation that the heart can’t compensate for. Even horses that survive initial hypothermia face a risk of post-rescue collapse during rewarming. If you suspect your horse is hypothermic rather than simply cold, keep the horse sheltered and loosely covered, but let a veterinarian manage the rewarming process.
Preventing Shivering Before It Starts
Horses that shiver repeatedly are burning through calories and body condition they’ll need for the rest of winter. A few adjustments reduce the chance of it happening again. Increase hay rations before cold weather hits, not after. A horse with a full hindgut fermenting fiber overnight generates considerably more body heat than one running on empty. Blanket before temperatures drop sharply rather than waiting for shivering to start, and match blanket weight to the forecast. A clipped horse or one with a thin winter coat needs heavier coverage than a horse with a full, fluffy coat, since that natural coat lofts to trap air much like a down jacket.
Check blankets daily for dampness, shifting, and rubs. A soaked or displaced blanket is worse than no blanket at all. And keep shelter access available at all times during winter. Horses are good at self-regulating when they can choose to get out of wind and precipitation on their own terms.