TL;DR: A dog falling to one side is typically caused by vestibular dysfunction, a balance system issue that requires a veterinary exam within 24 hours to rule out serious infections or neurological conditions.
Why is my dog falling to one side and losing its balance?
- Vestibular dysfunction is a disturbance in the balance system often caused by inner ear infections, inflammatory disease, or "Old Dog Vestibular Disease."
- The condition can make a dog feel as though the room is spinning, leading to a loss of coordination known as ataxia.
- Other common signs include a persistent head tilt to one side or eyes that flicker rapidly from side to side.
Is it an emergency if my dog keeps falling over?
- The urgency level for this behavior is generally Medium; while alarming, it is rarely life-threatening unless accompanied by seizures, collapse, or blue-tinged gums.
- You should schedule a veterinary appointment as soon as possible, ideally within 24 hours, to rule out serious issues that require medication.
How does taking a video of my dog help with triage?
- Because balance issues can be intermittent or triggered by specific movements, a recording allows the vet to see the exact behavior.
- Visual evidence of the falling, the direction of the head tilt, and eye movements helps the clinical team differentiate between ear issues and complex neurological concerns.
Clinical Context (Merck Veterinary Manual)
Unilateral or asymmetric vestibular lesions can manifest as head tilt, dysequilibrium, and a tendency to circle, fall, or roll to one side. Vestibular dysfunction specifically causes ipsilateral falling, rolling, or circling. Examination should include assessment for spontaneous nystagmus (with and without positional changes), and abnormal eye position (ventral strabismus) on the affected side when the nose is elevated. Unilateral lesions of the vestibulocochlear nerves produce dysequilibrium with a head tilt toward the side of the lesion and a spontaneous positional, horizontal, or rotary nystagmus that is typically more severe on the side of the lesion. Cerebellar lesions can also produce ataxia and dysmetria.
Chapter: Neurology
Source: The Merck Veterinary Manual, 11th Edition (Page 1216)