Dogs can't tell you they feel sick — but they show it. Lip licking, excessive drooling, repeated swallowing, and eating grass are all signs that your dog is feeling nauseous. Nausea isn't a diagnosis; it's a symptom of many different underlying conditions, ranging from a one-time bout of dietary indiscretion to something that needs prompt veterinary attention. Understanding what nausea looks like — and what might be causing it — helps pet parents know when to wait and watch vs. when to call the vet.
What Are the Signs of Nausea in Dogs?
Dogs can't verbalize discomfort, but their behavior gives it away. According to VCA Animal Hospitals¹, dogs experiencing nausea often appear restless and apprehensive, showing these signs before any vomiting begins:
Lip licking or smacking — one of the earliest and most reliable signs
Excessive drooling or salivation
Repeated swallowing — as if trying to keep something down
Yawning more frequently than normal
Eating grass — a common response to stomach upset
Refusing food even at mealtime
Restlessness or pacing
Vomiting — when nausea progresses
A dog can be clearly nauseous for hours without ever vomiting. These behavioral signs alone are enough to prompt close monitoring or a vet call, depending on how long they persist.
What Causes Nausea in Dogs?
The range of causes spans minor to serious. Most cases fall into one of these groups:
Mild and common:
Dietary indiscretion — eating too fast, too much, or getting into garbage or table scraps is one of the most frequent triggers
Motion sickness — especially common in puppies and younger dogs during car travel
Medications — antibiotics, NSAIDs, and other drugs can cause stomach upset as a side effect
Stress or anxiety — some dogs develop gastrointestinal symptoms during travel, boarding, or thunderstorms
More concerning:
Intestinal parasites — roundworms, hookworms, and giardia frequently cause nausea and GI distress
Bacterial or viral infections — parvovirus and other pathogens can cause severe nausea and vomiting
Pancreatitis — inflammation of the pancreas, often triggered by a high-fat meal
Foreign body ingestion — dogs that swallow socks, toys, or bones may show persistent nausea as the object sits in the GI tract
Serious:
Kidney or liver disease — nausea is a common symptom when organ function is impaired²
Addison's disease — can cause episodic nausea and vomiting
Toxin ingestion — many household plants, foods, and chemicals are toxic to dogs
Cancer — GI or systemic cancers can produce chronic or recurring nausea
Nausea vs. Vomiting: What's the Difference?
Nausea is the sensation of being about to vomit — it can exist for hours without actual vomiting occurring. Vomiting is the physical act of expelling stomach contents. According to the Merck Veterinary Manual², nausea involves excessive drooling, retching, and abdominal muscle activity even before stomach contents are expelled.
That distinction matters: a nauseous dog that never vomits is still uncomfortable and may still have an underlying condition worth evaluating. The absence of vomiting doesn't mean everything is fine.
How Is Nausea in Dogs Treated?
Treatment depends entirely on the underlying cause.
For mild, situational nausea:
Withhold food for 12–24 hours — this lets the stomach settle; always keep water available
Offer bland food once nausea passes — plain boiled chicken and white rice in small, frequent portions is the standard transition back to regular meals
Limit access to grass, garbage, and table scraps while your dog recovers
Prescription medications:
For cases that need veterinary care, maropitant citrate (Cerenia®) is the most commonly prescribed anti-nausea medication for dogs — it blocks the receptors that trigger vomiting and can be given as an injection or oral tablet.¹ Depending on the situation, vets may also prescribe metoclopramide (Reglan®) to promote gut motility, or metronidazole (Flagyl®) to reduce GI inflammation.¹
Anti-nausea medications should only be used under veterinary direction. Masking nausea without diagnosing the cause can delay treatment for something that needs urgent attention.
When Should You Call the Vet?
Most mild nausea resolves within a few hours. Call your vet — or go to an emergency clinic immediately — if your dog:
Vomits blood or material that looks like dark coffee grounds
Has been nauseated or vomiting for more than 24 hours
Shows lethargy alongside nausea — when these two symptoms appear together, they can signal serious illness; see lethargy in dogs for what to watch for
Has a distended, hard, or painful abdomen — this can indicate bloat (GDV), a life-threatening emergency requiring immediate surgery
Is a puppy, senior dog, or has known health conditions — these pets decompensate more quickly
May have ingested a toxin — call the ASPCA Animal Poison Control Center immediately
Shows signs of dehydration: dry or tacky gums, sunken eyes, or reduced skin elasticity
For a sense of what a vet exam and diagnostics typically cost, see how much does a vet checkup cost.
Frequently Asked Questions
What can I give my dog for nausea?
For mild nausea, withholding food for 12–24 hours followed by small amounts of bland food (boiled chicken and plain white rice) is the standard first step. For more significant cases, your vet may prescribe maropitant citrate (Cerenia®), the most commonly used anti-nausea drug for dogs.¹ Human medications like Pepto-Bismol or Dramamine require vet guidance before use — the safe dose for dogs differs significantly from human doses.
How long does nausea in dogs usually last?
Mild nausea from dietary indiscretion or motion sickness typically resolves within a few hours. If your dog is still showing signs after 24 hours — especially alongside repeated vomiting, lethargy, or loss of appetite — that's time to call the vet. Nausea that comes and goes over several days is more likely to have an underlying cause that needs a diagnosis.
Can nausea in dogs be a sign of something serious?
Yes. While most nausea is short-lived and self-limiting, it can also be an early symptom of pancreatitis, intestinal obstruction, kidney or liver disease, Addison's disease, or toxin ingestion.² Any nausea paired with lethargy, abdominal pain, bloody vomit, or symptoms lasting more than 24 hours warrants prompt veterinary evaluation.
Does pet insurance cover treatment for nausea in dogs?
Accident and illness pet insurance typically help cover the diagnostics and treatment needed to identify the underlying cause of nausea — including vet exams, blood work, imaging, prescription medications, and hospitalization if needed. Coverage applies when the condition is not pre-existing; see pre-existing conditions and pet insurance to understand how those rules apply and why enrolling before symptoms appear matters.
The right pet insurance plan should help support your pet through both unexpected accidents and health needs. Understanding what's included in your policy can help you choose coverage that fits your pet's lifestyle.
Spot Pet Insurance offers accident and illness coverage to help reimburse eligible costs related to covered injuries, illnesses, diagnostics, and treatment. Pet parents can also add optional preventive care coverage for routine services like annual exams, dental cleanings, and certain vaccines. Learn more about what pet insurance covers or get a free quote.
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VCA Animal Hospitals. Vomiting in Dogs. VCA Animal Hospitals.
Merck Veterinary Manual. Vomiting in Dogs. Merck Veterinary Manual.
