Why Is My Dog Shaking? Common Causes and When to Worry

What it usually means

Cold is the simplest explanation. Small dogs, puppies, seniors, and thin-coated breeds such as Chihuahuas, Greyhounds, and Whippets lose heat quickly and shiver sooner than sturdy, heavy-coated dogs. Excitement is another: many dogs tremble with anticipation when the leash comes out or a favorite person arrives home, and the shaking fades as soon as the walk starts.

Fear and anxiety are very common causes too, during storms, fireworks, vet visits, and car rides, often with a tucked tail, lip licking, yawning, and hiding. And a wet dog shaking off water, or a dog giving a full-body shake after a tense moment, is normal behavior that resets the coat and, it seems, the mood.

Medical reasons dogs shake

Pain is easy to miss. A dog with a sore back, neck, belly, or joints may tremble, hold themselves stiffly, and be reluctant to move or jump. Nausea can cause shaking with drooling, lip licking, and swallowing, often before vomiting. Persistent head shaking, rather than whole-body trembling, usually points to the ears.

Low blood sugar can cause trembling, weakness, and wobbliness, especially in toy breeds and young puppies who miss a meal. Toxins such as chocolate, xylitol in sugar-free gum, some moldy foods, and cigarette butts can cause tremors. Shaker syndrome causes whole-body tremors in young adult dogs, most often small white breeds, and older dogs can develop leg tremors as muscle weakens.

When to call your vet today

Call your vet the same day if the shaking is new and you cannot find a reason, if it continues once your dog is warm and calm, or if it comes with vomiting, diarrhea, limping, a hunched posture, or reluctance to move. Those combinations often mean pain or illness rather than nerves.

Also book a visit if your dog shakes regularly, if a senior dog has developed trembling back legs, or if anxiety is causing shaking most days. A short video of an episode on your phone is very helpful, because shaking often stops in the exam room.

When it's an emergency

Go to an emergency vet now if your dog is shaking and also collapses, cannot stand, seems confused, is breathing hard, or loses consciousness, or if the shaking turns into stiff jerking or paddling, which may be a seizure. A puppy or toy dog who is trembling, limp, and weak may have dangerously low blood sugar and needs to be seen straight away.

If your dog might have eaten something toxic, such as chocolate, gum or candy with xylitol, medicine, rat bait, or moldy food from the trash, call ASPCA Animal Poison Control at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661 on the way to the vet. A fee may apply.

What you can safely do at home

If cold is the likely cause, bring your dog inside, dry them off, and offer a warm bed or blanket. A coat or sweater can help small and thin-coated dogs on winter walks. If fear is the cause, give your dog a quiet, den-like spot to retreat to, close the curtains during fireworks, and stay calm and close without forcing attention.

Do not give your dog any human medicine, calming supplement, or pain reliever to stop shaking: several are dangerous to dogs, and they can hide the real cause. For dogs with ongoing anxiety, your vet can talk you through behavior plans and, if needed, prescribed treatment.

What the vet will likely check

Your vet will ask when the shaking happens, how long it lasts, and what else you have noticed, then examine your dog for pain, fever, ear problems, and neurological signs. They may check blood sugar and run blood and urine tests to look at organ function, especially in puppies, toy breeds, and seniors.

If those are normal and the shaking continues, further tests or a referral to a neurologist may be suggested. Conditions such as shaker syndrome are diagnosed only after other causes are ruled out, and many respond well to treatment.

Preventing shaking from cold and fear

Keep small and short-coated dogs warm in winter with a coat, a draft-free bed, and shorter walks on very cold days. Feed toy breed puppies small, regular meals, as your vet advises, so they do not go long without food.

For noise fears, start getting your dog used to recordings of thunder or fireworks at a very low volume well before the season, pairing the sounds with treats and play. Keep toxic foods, gum, medicines, and cigarette butts well out of reach.

This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.