French Bulldog Shaking and Trembling: Causes and When to Act

Shaking and trembling in French Bulldogs ranges from the entirely benign to the veterinary urgent. Understanding the most likely causes, and the signs that distinguish a harmless shiver from something requiring immediate attention, makes it easier to respond appropriately rather than either over-reacting to normal behaviour or missing something serious.

Common benign causes of shaking

Being cold

French Bulldogs have short, single-layer coats with minimal insulating undercoat and a relatively high surface-area-to-volume ratio compared to larger breeds. They chill easily, particularly in the UK from autumn to spring. Shivering from cold is normal physiological thermoregulation, the muscle activity generates heat.

Signs it is cold-related: the dog was outside or in a cool environment; the shaking stops quickly once the dog is warm; there are no other symptoms. A Frenchie in a well-heated home in November who starts shaking after an evening walk is almost certainly just cold.

Excitement or anxiety

Trembling from excitement, before a walk, during play, when guests arrive, is common and normal. Anxiety-related trembling (before fireworks, at the vet, during car journeys) is also common. In both cases the shaking is contextual, linked to a specific stimulus, and resolves when the trigger is removed or the emotion subsides.

Post-sleep muscle activity

Some dogs have mild trembling or twitching as they wake up from deep sleep. This is usually brief, resolves within a minute and is not associated with distress.

Hypoglycaemia in puppies

Very young French Bulldog puppies (under twelve weeks) and very small adults can develop low blood sugar, particularly if they miss a meal or have an illness reducing appetite. Signs include weakness, shaking, confusion or disorientation. A tiny amount of honey or glucose solution rubbed on the gums can stabilise a puppy showing these signs while transport to a vet is arranged. This is a veterinary emergency in young puppies.

Idiopathic head tremors

Idiopathic head tremors, episodes of involuntary rhythmic head shaking, either side-to-side or nodding, are reported with notable frequency in French Bulldogs. The condition appears benign in most affected dogs: the dog remains fully conscious and responsive, the episode typically lasts one to five minutes, and there is no evident pain or distress.

What triggers head tremors in susceptible dogs is not established. Some owners report associations with hypoglycaemia, stress or physical exertion, but others see no consistent trigger. Many owners find that offering a high-value treat or engaging the dog’s attention can interrupt an episode.

Video the episode if possible: this is one of the most useful things an owner can do before a vet appointment, as the episode is likely to have resolved by the time the dog is examined.

Head tremors are distinct from seizures: the dog is responsive throughout, there is no post-ictal confusion, and there is no loss of consciousness. Distinguishing the two from a description alone is difficult, which is why video evidence helps significantly.

Pain-related shaking

Pain causes muscle tension and sometimes trembling, particularly when the dog is trying to stay still with an acutely painful injury or condition. French Bulldogs may shake in pain while also:

• Hunching or arching the back
• Refusing to jump up or lie down comfortably
• Crying or yelping unprovoked
• Showing reluctance to move or be touched in a specific area

Spinal pain from IVDD (intervertebral disc disease) is a significant cause in this breed, given its predisposition to disc problems. A dog that is shaking and showing any signs of spinal discomfort, wobbling when walking, dragging hind legs, crying when picked up, should be seen by a vet the same day, not monitored at home.

Neurological causes

Trembling can be a sign of neurological conditions including inflammatory brain disease (meningoencephalitis), toxin exposure, and other central nervous system disorders. These are less common than the causes above but more serious.

Red flags that suggest neurological involvement:

• Shaking that does not resolve and is not linked to cold or emotion
• Shaking accompanied by disorientation, circling, falling or uncoordinated movement
• Episodes that include loss of consciousness or responsiveness

Any episode where the dog is unresponsive should be treated as a potential seizure and assessed by a vet urgently. The French Bulldog seizures guide covers what a seizure looks like, how to respond and the treatment options available.

When to call the vet

Call the same day:

• Shaking accompanied by signs of pain (hunching, yelping, reluctance to move)
• Shaking with any neurological signs (disorientation, circling, falling)
• Shaking in a young puppy with signs of lethargy or weakness
• Post-exercise shaking that does not resolve

Emergency (vet immediately):

• Loss of consciousness or unresponsiveness during or after shaking
• Shaking with limb weakness or inability to stand
• Signs of overheating alongside shaking (very heavy breathing, red/purple tongue)

For the full range of health conditions that can present with neurological signs in this breed, the French Bulldog health problems guide covers BOAS, IVDD and the other conditions most relevant to the breed. For the spinal condition most commonly underlying pain-related shaking, the IVDD guide covers the anatomy, diagnosis and treatment.