Coach Max
A shaking dog can be alarming. Sometimes it’s nothing more than a chilly Chihuahua or a dog wiggling with excitement. Other times it’s a sign of fear, pain or illness. This guide helps you figure out which is which and when to call the vet.
10 Common Reasons Dogs Shake
1. They’re cold
Small, thin-coated, young and senior dogs shiver easily. Check our cold-weather temperature chart and consider a winter coat.
2. Excitement
Many dogs tremble with joy when you come home, before a walk or at mealtime. This shaking stops once they settle.
3. Fear, anxiety or stress
Thunderstorms, fireworks, vet visits, car rides and being left alone can all cause trembling, often with panting, pacing, hiding or a tucked tail.
4. Shaking off
The full-body “shake off” after a bath, a stressful moment or a nap is normal. Dogs use it to reset.
5. Pain
Shaking can be a sign of pain from injury, arthritis, back problems or tummy pain. Look for limping, hunching, reluctance to move or crying out when touched.
6. Nausea
Dogs that feel sick may tremble, drool, lick their lips and swallow a lot, especially before vomiting or during car rides.
7. Poisoning
Tremors are a warning sign of poisoning from chocolate, xylitol, some medications, certain plants, mushrooms, mold and pesticides. If there’s any chance your dog ate something toxic, call right away. See My Dog Ate Chocolate.
8. Old age
Senior dogs often develop trembling in the back legs from muscle weakness or joint changes. Still mention it to your vet, since pain may be involved.
9. Generalized tremor syndrome
Sometimes called “shaker syndrome,” this condition causes whole-body tremors, often in young adult dogs. It was first described in small white dogs like Maltese and West Highland White Terriers but can affect any breed. It’s treatable, so see your vet.
10. Other medical conditions
Low blood sugar (especially in toy-breed puppies), kidney disease, Addison’s disease, distemper, seizures and neurological problems can all cause trembling. These need a proper diagnosis.
Normal Shaking vs. Worrying Shaking
| Probably normal | Call your vet |
|---|---|
| Stops when your dog warms up | Continues for hours or keeps coming back |
| Happens during excitement and then fades | Comes with vomiting, diarrhea or not eating |
| A quick “shake off” after a bath | Comes with limping, crying or hunching |
| Short, during a known scary event | Comes with weakness, wobbliness or confusion |
| Your dog acts normal otherwise | Possible toxin exposure, collapse or seizure (emergency) |
How to Help a Shaking Dog
- Cold: bring them inside, dry them off, offer a warm blanket.
- Fear: move to a quiet room, stay calm, offer a chew or snuffle mat, and let them hide if they want. Comforting a scared dog does not “reward” the fear.
- Excitement: keep greetings low-key and reward calm behavior.
- Anything unusual: write down when it started, what your dog was doing, and any other symptoms, and call your vet.
If your dog shakes when visitors arrive, read How to Keep Your Dog Calm When Guests Visit. For fear of fireworks, storms and being left alone, our 21-day plan below walks you through it step by step.
Frequently Asked Questions
Why is my dog shaking and acting weird?
Shaking plus a change in behavior can mean pain, illness, poisoning or strong fear. Call your vet, especially if it came on suddenly.
Why is my dog shaking and panting?
This combination is common with fear, stress, pain or overheating. If there’s no obvious cause or it doesn’t settle quickly, contact your vet.
Why do small dogs shake so much?
Small dogs lose body heat faster and can be more easily stressed. Toy-breed puppies can also get low blood sugar, which needs quick attention.
Why are my senior dog’s back legs shaking?
It’s often muscle weakness or arthritis, but pain and neurological problems are possible too. Your vet can check and suggest pain relief or exercises.
The Bottom Line
Dogs shake for many reasons, from cold and excitement to fear, pain and illness. If shaking stops quickly and your dog acts normal, it’s usually nothing to worry about. If it lasts, keeps happening or comes with other symptoms, call your vet. Shaking with collapse, seizures or possible poisoning is an emergency.
