A dummy foal is a newborn horse that appears physically healthy at birth but quickly shows signs of neurological dysfunction, acting disoriented, detached, and unable to nurse. The condition affects 1 to 2% of newborn foals and is formally known as neonatal maladjustment syndrome (NMS) or neonatal encephalopathy. With early, aggressive treatment, up to 80% of affected foals survive and go on to live normal, productive lives.
Why It Happens
For decades, veterinarians believed dummy foal syndrome was caused by oxygen deprivation during birth. The thinking was straightforward: if something interrupted blood flow during delivery, the foal’s brain sustained damage, and the neurological signs followed. Difficult births, premature placental separation (sometimes called a “red bag” delivery), and uterine infections that compromise the placenta late in pregnancy all reduce the oxygen supply a foal receives in the womb or during the birthing process. The severity of brain involvement depends on how long the oxygen was cut off and how low levels dropped.
More recently, researchers at UC Davis discovered something that reshaped the conversation. Affected foals had abnormally high levels of certain neurosteroid hormones in their blood. These are natural sedative-like chemicals that keep a foal in a quiet, sleep-like state while it’s still inside the uterus. Normally, the physical pressure of passing through the birth canal signals the foal’s body to clear those hormones, essentially flipping a switch from “fetal mode” to “awake and ready for the outside world.” In dummy foals, that signal never fires properly, and the foal stays neurologically stuck in a pre-birth state.
This discovery also explained why some foals develop the syndrome after births that seem perfectly normal, with no obvious oxygen problems at all.
What a Dummy Foal Looks Like
Most dummy foals stand and seem fine in the first minutes after birth. The signs emerge within hours. The foal becomes detached from its mother, wandering aimlessly rather than staying close. It loses the instinct to find the udder and nurse. Some foals stand motionless and unresponsive, staring blankly. Others circle, bump into walls, or seem completely unaware of their surroundings. The name “dummy” comes from this vacant, disconnected behavior.
Beyond the brain, oxygen deprivation or hormonal disruption can affect other organ systems. Some foals lose the ability to regulate their body temperature. Gut motility slows or stops, meaning milk can’t move through the digestive tract normally. Breathing may be shallow or irregular. In severe cases, foals develop seizures, which can cause self-injury if the foal thrashes against stall walls or the ground. Eye injuries and corneal ulcers are a common complication during seizure episodes.
Births That Raise the Risk
Any delivery that compresses, shortens, or disrupts the normal passage through the birth canal increases the chance of a dummy foal. Specific risk factors include dystocia (a difficult or prolonged delivery), premature placental detachment, and cesarean section, where birth canal pressure is bypassed entirely. Ascending placentitis, a bacterial infection that travels up through the mare’s reproductive tract late in pregnancy, is another well-documented cause. The infection damages the connection between the placenta and the uterus, leading to chronic oxygen deprivation well before the foal is born. Foals delivered from mares with placentitis often arrive premature, weak, and at high risk for the syndrome.
Unusually fast births can also be a factor. If the foal passes through the birth canal too quickly, the pressure signals may not last long enough to trigger the hormonal transition.
The Madigan Squeeze Technique
The neurosteroid discovery led to a novel physical treatment developed by Dr. John Madigan at UC Davis. The idea is to simulate the pressure of the birth canal after the fact, triggering the hormonal “wake-up” signal the foal missed. A soft rope is looped around the foal’s torso, and steady, gentle pressure (roughly 10 pounds) is applied. The foal typically lies down within minutes. Pressure is maintained for about 20 minutes, then released.
The procedure can be repeated once or twice a day for up to three days and works best when performed within the first one to two days of life. Some foals respond dramatically, standing up after the squeeze and seeking the mare’s udder for the first time. Others need multiple sessions or additional medical support. The squeeze is not a cure-all, but it changed the treatment landscape for foals whose primary problem is hormonal rather than structural brain damage.
Supportive Care in the Hospital
Whether or not the squeeze technique is used, most dummy foals need intensive veterinary care. The overarching goal is to keep the foal alive and nourished while its nervous system recovers. Because newborn foals have almost no energy reserves, maintaining blood sugar is critical. Foals that can’t nurse are fed through a tube passed into the stomach, and those with gut dysfunction may need intravenous nutrition instead.
Fluid therapy helps maintain blood pressure and keeps adequate blood flowing to the brain, which prevents further injury. If the foal develops seizures, anticonvulsant medications are given to reduce brain oxygen consumption and limit the risk of physical trauma. The foal’s environment is padded to prevent injury during episodes. Eyes are monitored closely, since corneal ulcers from thrashing are common and can become serious if missed.
Foals with brain swelling may receive treatments to draw fluid away from the brain tissue. The entire approach is about buying time: protecting organs from further damage while the foal’s body completes the transition it failed to make at birth.
Survival Rates and Long-Term Outlook
For foals with neonatal encephalopathy as their only problem, survival rates sit in the range of 70 to 80%. That number drops when complications enter the picture. A 2024 study of foals hospitalized with the syndrome and additional health problems (prematurity, infection, organ dysfunction) found an overall survival rate of 57.4%. The takeaway is clear: early recognition and treatment matter enormously, and the presence of other conditions at birth significantly changes the odds.
The good news for foals that do survive is that long-term outcomes are overwhelmingly positive. Horses that were treated as dummy foals go on to live normal lives, whether as pleasure horses or competitive athletes. There is no well-documented pattern of lasting cognitive or behavioral deficits in foals that received prompt, adequate care. The prognosis worsens with delayed treatment, prematurity, or concurrent infection, but a full-term foal that gets help quickly has an excellent chance of growing into a completely normal horse.