Most of the time, a dog shakes after vomiting because the physical effort of throwing up is exhausting and uncomfortable. Vomiting triggers a rush of adrenaline, causes abdominal muscle fatigue, and can leave your dog feeling nauseous, cold, or anxious. The shaking is often a temporary stress response that passes within 30 minutes to an hour. But in some cases, the combination of vomiting and shaking points to something more serious, like poisoning, severe dehydration, or an abdominal emergency.
Common Reasons Dogs Shake After Vomiting
Vomiting is a violent physical act for dogs. It engages the diaphragm, abdominal wall, and core muscles in repeated forceful contractions. Afterward, many dogs tremble simply because those muscles are fatigued and their body is flooded with stress hormones. This is the canine equivalent of feeling shaky after you’ve been sick to your stomach.
Nausea itself also causes shaking. Dogs can’t tell you they feel queasy, but their bodies show it through trembling, drooling, lip-licking, and restlessness. If your dog ate something that disagreed with them, like table scraps, garbage, or a new food, the nausea and shaking often resolve once their stomach settles. A drop in blood sugar after vomiting, especially in small breeds or puppies, can also produce visible trembling.
Cold is another overlooked factor. Vomiting can lower a dog’s body temperature slightly, and the shaking may simply be shivering. A normal canine body temperature runs between 101 and 102.5°F. If your dog feels cool to the touch on their ears or paw pads, warming them with a blanket can help.
When Poisoning Is the Cause
The combination of vomiting followed by shaking is a hallmark pattern for several common household toxins. If there’s any chance your dog got into something they shouldn’t have, this is worth taking seriously and quickly.
Moldy food is one of the most frequently missed culprits. Tremorgenic mycotoxins, which grow on spoiled dairy, bread, pasta, and compost, cause both gastrointestinal symptoms and tremors. Dogs that raid trash cans or compost bins are particularly at risk. Slug and snail baits containing metaldehyde produce a similar picture: vomiting, elevated body temperature, and progressive shaking that can escalate to seizures. Rodent baits made with zinc phosphide also cause vomiting and tremors.
Other toxins that produce this vomiting-then-shaking pattern include flea and tick products containing pyrethrin-type chemicals (especially products formulated for cats that are mistakenly applied to dogs), nicotine from chewed cigarettes or nicotine patches, and the ornamental plant Brunfelsia (yesterday-today-and-tomorrow), which causes vomiting, tremors, and stiffness. If you suspect any of these, don’t wait to see if the shaking stops on its own.
Dehydration and Electrolyte Loss
Repeated vomiting strips your dog’s body of fluids and essential electrolytes, particularly sodium and potassium. When potassium drops too low, muscles can’t function normally, which produces weakness and visible tremors. Severe sodium loss affects brain function, causing lethargy, confusion, and in extreme cases, seizures.
You can check for dehydration at home with two quick tests. First, gently lift the skin on the back of your dog’s neck and release it. In a well-hydrated dog, the skin snaps back immediately. If it stays tented or returns slowly, your dog is dehydrated. Second, press a finger against your dog’s gums. They should feel wet and slippery. Dry, tacky, or sticky gums are a clear sign of fluid loss. Sunken eyes and extreme weakness are later-stage signs that call for immediate veterinary care.
A dog that has vomited once or twice but is still drinking water and keeping it down is unlikely to become dangerously dehydrated. A dog that vomits repeatedly and can’t hold water down can deteriorate within hours, especially puppies, small breeds, and senior dogs.
Bloat: The Abdominal Emergency
One critical condition to rule out is bloat, formally known as gastric dilatation-volvulus (GDV). This happens when the stomach fills with gas and twists on itself, cutting off blood flow. It progresses fast and is fatal without surgery.
The key warning sign that distinguishes bloat from ordinary vomiting is unproductive retching, where your dog heaves and gags but nothing comes up. Other signs include a visibly swollen or hard abdomen, restlessness and pacing, excessive drooling, rapid or labored breathing, pale gums, and collapse. Large, deep-chested breeds like Great Danes, German Shepherds, and Standard Poodles are at highest risk, but any dog can develop it. If you see unproductive retching combined with a distended belly, treat it as an emergency.
What to Do in the First Few Hours
If your dog is alert, responsive, and the vomiting seems like an isolated episode, you can monitor them at home. Withhold food for 12 to 24 hours to let the stomach rest, and limit water to small amounts at a time so they don’t drink too fast and vomit again. Washington State University’s veterinary hospital recommends withholding food for up to 24 to 48 hours in acute vomiting episodes, though veterinary consultation before starting home treatment is always a good idea.
During this time, watch the shaking closely. Mild trembling that gradually fades over 30 to 60 minutes, especially if your dog is willing to rest and seems otherwise normal, is usually just the aftermath of being sick. Shaking that intensifies, continues for hours, or comes with new symptoms like stumbling, disorientation, or repeated vomiting is a different story.
Keep your dog in a warm, quiet space. Offer comfort but don’t force interaction if they want to be left alone. Some dogs prefer to curl up and sleep it off, which is a good sign.
Signs That Need Immediate Veterinary Care
Head to an emergency vet if your dog shows any of the following alongside vomiting and shaking:
- Repeated vomiting (more than once or twice in 24 hours) or inability to keep water down
- Blood in vomit or stool
- Loss of coordination, stumbling, or collapse
- Swollen, hard abdomen or unproductive retching
- Signs of dehydration: dry gums, sunken eyes, skin that won’t spring back
- Possible toxin exposure: you found chewed packaging, disturbed trash, or your dog had access to chemicals, plants, or medications
- Extreme lethargy: your dog won’t lift their head or respond to you normally
- Pale or white gums
Puppies under six months and elderly dogs deserve a lower threshold for concern. Their bodies have less reserve to handle fluid loss, and conditions can worsen quickly. If something feels off, even if you can’t pinpoint exactly what, err on the side of calling your vet. A brief phone consultation can help you decide whether to come in or continue watching at home.
Why the Shaking Usually Stops
In the majority of cases, a dog that throws up once from eating something disagreeable and trembles for a little while afterward is going through a normal recovery process. The nausea passes, the adrenaline wears off, their body temperature stabilizes, and the shaking resolves on its own. Dogs that return to their normal behavior within a few hours, show interest in water, and don’t vomit again are generally fine. If vomiting or depression continues beyond a few days, or if your dog seems dehydrated or won’t eat or drink for more than 24 hours, a veterinary evaluation is the right next step.