Horse Side Vet Guide ®

Equine Health Resource

Noticeably Wobbly or Weak

Code Red - Call Your Vet Immediately, Even Outside Business Hours

Code Orange - Call Your Vet at Their First Available Office Hours

Code Red - Call Your Vet Immediately, Even Outside Business Hours

  • If you feel the problem is severe or has come on suddenly.
  • If the results of the Whole Horse Exam (WHE) in the resting horse indicate fever (Temp >101F/38.3C) or heart rate greater than 48 BPM.

Code Orange - Call Your Vet at Their First Available Office Hours

  • If you consider this a chronic and relatively mild problem that is not changing rapidly.
  • If the results of the Whole Horse Exam (WHE) suggest the horse is otherwise normal.

Wobbliness or apparent unsteadiness (ataxia) is a classic sign of a neurologic problem. It often appears worse in the hind limbs because the nerve pathways in the spinal cord are longer and more vulnerable than those to the front limbs.

However, many other advanced or severe disease processes can cause a horse to appear as if it is about to fall down, including spinal and brain injury, major blood loss or end-stage shock. Signs associated with abdominal pain (colic) can also be confused with weakness, wobbliness or fainting. Horses that are in colic pain crouch, tremble, get up and down and can appear unstable on their feet.


Regardless, if a horse seems severely wobbly or weak, contact your vet immediately. Personal safety is very important. Horses can suddenly fall on a handler or pin them against a wall. Leave the horse alone in a bedded and secure stall and keep them calm until your vet arrives. If the incoordination is less severe, then you may be able to carefully evaluate your horse’s general health using the Whole Horse Exam (WHE) and share your findings and concerns with your vet.


Your vet will seek to determine the nature of the problem causing the incoordination with diagnostics and recommend appropriate treatment.

NOTE: This observation is associated with Rabies, which is very rare in horses but does occur. As a precaution, always wear gloves when handling a horse exhibiting this sign.

Identify or Rule-Out Possible CausesDIAGNOSES

Brain, Traumatic Injury, Concussion & Brain Swelling
Cervical Vertebral Malformation, CVM
Equine Protozoal Myeloencephalitis, EPM
West Nile Virus, WNV
Equine Herpes Myeloencephalitis, EHM
Shock, Circulatory Shutdown
Older Horse Ataxia & Weakness
Eastern, Western & Venezuelan Equine Encephalomyelitis
Sedation Effects
Endotoxemia, Endotoxic Shock
Neuroaxonal Dystrophy, NAD
Internal Hemorrhage, Bleeding Internally
Blood Loss or Acute Hemorrhage, Generally
Colic, Undiagnosed Conditions Causing
Fracture of Neck Vertebrae
Ear Tick Infestation
Hypoglycemia, Low Blood Sugar
Neurologic Conditions, Generally
Hyperkalemic Periodic Paralysis, HYPP
Locoweed Toxicity
Fracture of Skull, Involving Sinus or Bone
Ryegrass or Dallis Grass Staggers
Meningo-Encephalitis, Meningitis
Fracture of Skull, Not Involving Sinus
Ruptured Stomach or Intestine
Plant or Weed Toxicity, Generally
Equine Herpesvirus 1 & 4, Rhinopneumonitis
Infectious Myelitis
Post-Anesthetic Neuropathy, Myopathy or Myoneuropathy
Horsetail or Bracken Fern Toxicity
Lead Poisoning
Organosphosphate Toxicity
Monensin Toxicity
Hendra Virus, HeV
Acute Systemic Disease, Generally
Moldy Corn Toxicity
Cardiotoxic Plants, Generally
Amitraz Toxicity
Ergot Toxicity
Seasonal Pasture Myopathy
Equine Infectious Anemia, EIA
Equine Granulocytic Ehrlichiosis, EGE
Acute Respiratory Distress Syndrome, ARDS
Cauda Equina Neuritis
Trypanosomiasis, Surra, Mal de Caderas
Water Hemlock Toxicity
Marijuana Toxicity
Blue Green Algae Toxicity
Japanese Encephalitis
Johnson or Sudan Grass Toxicity
Hemlock Toxicity
Equine Motor Neuron Disease, EMND
Fracture of Hip, Pelvis
Borna Disease
Onion Toxicity
Phenothiazine Toxicity
Autoimmune Hemolytic Anemia
Paspalum Staggers
Selenium Toxicity
Cerebellar Abiotrophy, CA
Arsenic Toxicity
Conditions Affecting Red Blood Cells, Generally
Nitrate Toxicity
Liver Failure, Generally
Clotting Factor Deficiency, Coagulation Problem
Stinging Nettle, Skin Irritation
Multiple Myeloma
Neurotoxic Snakebite, Coral Snake, Cobra
Von Willebrand's Disease, Bleeding Disorder
Neck Conditions, Generally
Lyme Disease, Borreliosis
Equine Grass Sickness
Equine Chagas Disease
Besnoitia, Besnoitiosis

POSSIBLE TREATMENTS or TherapiesTo Lessen or Resolve the Sign

Author: Doug Thal DVM Dipl. ABVP


Bathe AP. An unusual manifestation of nettle rash in three horses. Vet Rec 1994;1;134(1):11-12.


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