Why Does My Dog Shake?
Quick Answer
Shaking or trembling in dogs, beyond just being cold or wet, has many possible causes ranging from entirely normal — excitement, or a post-stress 'shake it off' reset — to medical causes that need veterinary attention, such as pain, low blood sugar, poisoning, generalized tremor syndrome, or seizure activity. The context, duration, and any accompanying signs matter far more than the shaking on its own.
Common Reasons
- Excitement or anticipation. Trembling that appears alongside happy arousal — before a walk or an enthusiastic greeting — and settles once the exciting moment passes.
- Stress or fear. A whole-body shake can act as a tension-release response, for example right after a stressful vet visit.
- Pain. Shivering or trembling can be a pain signal, especially in small and toy breeds.
- Generalized tremor syndrome. Sometimes called "shaker syndrome," this is an idiopathic condition most recognized in small white-coated breeds like Maltese and West Highland White Terriers, though it can occur in any dog; tremors often worsen with excitement or exercise and ease with rest.
- Medical causes needing prompt attention. Low blood sugar (especially in toy breeds and puppies), toxin exposure such as chocolate or xylitol, or seizure activity can all present as shaking.
What This Behaviour May Mean
VCA's guidance on shaker syndrome is clear that it's a "diagnosis of exclusion" — vets need to rule out other causes like liver disease, kidney disease, or infectious disease through bloodwork and urinalysis before attributing tremors to this specific condition, and any new-onset tremor deserves a professional look. AKC's Chief Veterinary Officer draws a similar distinction between ordinary excitement-shaking and seizure activity, noting that seizures can sometimes present as "uncontrollable shaking for several minutes" alongside muscle contractions, jerking, collapse, or a brief loss of consciousness — a noticeably different and more urgent picture than a quick excited tremor.
What You Can Do
Pay attention to the context: was your dog excited, scared, cold, or in a new situation? If shaking recurs, it helps to keep a brief log of when it happens, how long it lasts, and what came before and after, so you have something concrete to share with your vet. For toy-breed puppies especially, feeding regularly helps avoid blood-sugar dips, and keeping known toxins like chocolate and xylitol well out of reach removes another common cause.
When It May Be Worth Paying Closer Attention
Contact your veterinarian if your dog starts shaking and the cause isn't obvious, and seek immediate or emergency veterinary care if poisoning is suspected or the shaking looks like it could be a seizure — rigid or paddling limbs, collapse, disorientation, or loss of consciousness. Persistent, unexplained, or worsening tremors, as opposed to a one-off excited wiggle, generally warrant a veterinary exam. This is general information, not a diagnosis.