Drooling in the Car: Is It Normal for Dogs?
Drooling in the car is often normal for dogs, especially if caused by motion sickness, anxiety, or breed-specific anatomy. However, excessive drooling may indicate a medical problem like nausea, dental pain, or overheating. - Breeds with loose lips (e.g., mastiffs, bloodhounds) drool more. - Motion sickness and anxiety are common triggers in cars. - Sudden or unexplained drooling needs a vet check.
Why Dogs Drool in the Car
Drooling in the car is often linked to motion sickness, which causes nausea and increased saliva production. Dogs may also drool due to anxiety or fear when riding in vehicles, especially if they’re not used to it. The brain controls saliva production, and stress or anticipation of travel can trigger excessive salivation. This is a normal reflex, not a behavior dogs can control.
Breed Traits and Excessive Drooling
Certain dog breeds—such as mastiffs, bloodhounds, Newfoundlands, and St. Bernards—have loose upper lips, or “flews,” which naturally cause them to drool more. This anatomical trait means they produce more saliva than other breeds, and drooling is more noticeable, especially during movement like car rides. While this is normal for these dogs, it can be surprising to owners unfamiliar with the trait.
When Drooling Signals a Health Problem
Excessive drooling, or hypersalivation (also called ptyalism), can be a sign of underlying health issues. If your dog drools heavily in the car and shows other symptoms—like gagging, pawing at the mouth, vomiting, or acting irrationally—it could indicate a foreign object in the throat, dental pain, periodontal disease, or even heat stroke. Drooling can also be linked to rabies, distemper, or poisoning, though these are less common. If drooling is sudden and unexplained, a vet visit is recommended.
Managing Drool in the Car
There’s no need to panic over normal drool. Simple solutions include keeping a towel or bib in the car to wipe excess saliva. Avoid extreme measures like “mouth diapers” or surgery to alter lip shape—these are unnecessary and can harm your dog’s comfort. Instead, focus on reducing anxiety through gradual exposure to car rides and positive reinforcement. Ensure your dog is cool and hydrated, as drooling also helps dogs cool down through evaporation.
When to See a Veterinarian
If drooling is new, severe, or accompanied by other symptoms—like difficulty swallowing, coughing, lethargy, or loss of appetite—contact your veterinarian. These signs could point to a serious issue like a foreign body in the throat, infection, or neurological condition. Early evaluation helps rule out medical causes and ensures your dog stays healthy and comfortable during car travel.
Frequently asked questions
Can motion sickness cause drooling in dogs?
Yes, motion sickness often leads to nausea and increased salivation, which causes drooling in the car.
Is drooling normal for all dog breeds?
All dogs drool to some degree, but breeds with loose lips (like bloodhounds and mastiffs) naturally drool more due to their anatomy.
Sources
- Unleashing Your Dog A Field Guide to Giving Your Canine Companion the Best Life Possible · Marc Bekoff Jessica Pierce · Chapter on drooling and breed traits
- Dog Owners Home Veterinary Handbook · Debra M. Eldredge · Section on hypersalivation and medical causes
⚠️ Important: this article is a literature summary, not a case diagnosis. Every dog is different — breed, age, and history all affect the plan. For severe anxiety or aggressive barking, contact a certified behavior trainer or veterinary behaviorist.