The honest answer is more complicated than a simple yes or no. Lemongrass essential oil sits in a gray area. Some veterinary sources flag the lemongrass plant as toxic to dogs, while others don't list the oil among the most dangerous options out there. Much depends on the concentration, how your dog is exposed, and whether the oil is ever ingested.
Lemongrass essential oil shows up in everything from natural flea sprays to calming diffuser blends. It smells fresh, it’s marketed as a gentle plant-based remedy, and plenty of pet brands claim it can benefit your dog. But if you’ve ever paused before switching on your diffuser with your pup snoozing nearby, your instinct is worth listening to. This guide breaks down what the science and veterinary experts actually say. You’ll learn how the ASPCA classifies lemongrass, why dogs react to essential oils so differently than we do, the real risks to watch for, and the safest way to approach these oils if you choose to use them at all.
What Is Lemongrass Essential Oil?
Lemongrass essential oil comes from Cymbopogon citratus, a tall tropical grass with a bright, citrusy scent. The oil is extracted from the plant’s leaves and stems, then bottled in a highly concentrated form. That concentration is the key thing to remember. A single drop of essential oil packs the potency of a large amount of the raw plant.
People use lemongrass oil for aromatherapy, homemade cleaning products, and natural insect repellents. Its fresh smell and reputation as a bug deterrent are exactly why it turns up in so many pet products. But “natural” doesn’t automatically mean “safe,” especially for an animal whose body processes these compounds very differently from ours.
What Does the ASPCA Say About Lemongrass and Dogs?
Here’s where things get tricky. The ASPCA lists lemon grass (Cymbopogon citratus) as toxic to dogs, cats, and horses.
According to the ASPCA, the toxic principles are essential oils and cyanogenic glycosides. The clinical signs in dogs and cats are listed as stomach upset. In horses, the effects can be more serious, including difficulty breathing, weakness, and, in rare cases, death.
That classification refers to the plant itself. When it comes to the concentrated essential oil, the picture is a little more nuanced. Notably, lemongrass does not appear on the Pet Poison Helpline’s list of the essential oils most commonly linked to poisoning in dogs. Those top offenders are tea tree oil, pennyroyal, oil of wintergreen, and pine oils.
Lemongrass is also absent from the toxic essential oil list compiled by Dr. Murl Bailey, a professor at the Texas A&M College of Veterinary Medicine & Biomedical Sciences. So while lemongrass isn’t considered as immediately dangerous as tea tree or wintergreen oil, the ASPCA classification is a clear signal to treat it with real caution.
Why Dogs React to Essential Oils Differently Than People
It’s easy to assume that if an oil is gentle for you, it’s gentle for your dog. That assumption can get pets into trouble.
Dogs have an extraordinarily powerful sense of smell. Their noses can be up to 100,000 times more sensitive than ours. A scent that feels pleasant and subtle to you can be overwhelming to a dog sharing the same room. Beyond scent sensitivity, dogs also process certain compounds, particularly phenols and terpenes, differently than humans do. These substances are common in essential oils, and a dog’s body may struggle to break them down efficiently.
There’s another factor many owners overlook: essential oils are not regulated. As Dr. Bailey points out, the concentration and safety information printed on a label may be unknown when it comes to pets. Two bottles labeled “lemongrass oil” could differ significantly in strength and purity. That uncertainty makes careful use even more important.
The Real Risks: How Dogs Get Exposed
There are three main ways a dog can be exposed to lemongrass essential oil, and each carries its own level of risk.
Ingestion
This is the most serious route. If a dog licks up spilled oil, chews a bottle, or ingests oil that was applied to their fur, the consequences can be significant. Even sources that view lemongrass oil as relatively low-risk agree that swallowing it can cause vomiting, diarrhea, and other gastrointestinal problems.
Dr. Bailey is direct on this point: “Essential oils should never be given by mouth or in the animal’s food. Oral ingestion can cause vomiting, diarrhea, and central nervous system depression, which can cause symptoms such as decreased heart and breathing rate. Seizures are also possible from large doses.”
Skin Absorption
Essential oils can absorb through the skin, and this creates a hidden risk. When you apply oil to a dog’s coat, they often lick it off during grooming, turning a topical exposure into an ingestion problem. Concentrated, undiluted oil applied to skin can also cause direct irritation or even burns.
If a vet ever does recommend a topical application, the base of the neck is the safest spot, since it’s one of the few places a dog can’t easily reach with their tongue.
Inhalation and Diffusing
Because of their sensitive noses, dogs can be affected simply by breathing diffused oil in an enclosed space. A diffuser running in a small, poorly ventilated room can bother a dog well before it bothers you. Airborne oil droplets can also settle on your dog’s fur, which then leads back to ingestion during grooming.
Warning Signs of Essential Oil Toxicity in Dogs
Whether you’re using lemongrass oil deliberately or worry your dog got into it by accident, knowing the red flags matters. Watch for:
- Behavior changes, such as depression, fatigue, or weakness
- Difficulty breathing, including labored or fast breathing, coughing, or wheezing
- Drooling or vomiting
- Diarrhea
- Muscle tremors
- Ataxia, meaning difficulty walking, stumbling, or wobbling
- Redness, irritation, or burns around the mouth, nose, or paws
- Paralysis of the rear legs
- Coughing or sneezing
- Pawing at the face or rubbing against furniture
If you notice any of these signs, especially after using oils in your home, act quickly. Get your dog to fresh air and contact a vet.
The Potential Benefits (and Why Context Matters)
You’ve probably seen lemongrass oil promoted for its supposed perks. Some pet product companies point to benefits like:
- Natural flea and tick repellent thanks to its insecticidal properties
- Anti-inflammatory effects when diluted and applied to affected areas
- Odor elimination in living spaces
- Anxiety relief, since some dogs find the scent calming
- Antibacterial and antifungal properties
It’s worth being clear-eyed about these claims. They come largely from wellness-focused and product-selling sources rather than rigorous veterinary studies. Any potential benefit is tied to proper dilution and cautious, occasional use. The same oil that might freshen a room can cause stomach upset if your dog laps up a puddle of it. Benefits and risks aren’t separate conversations; they’re two sides of the same bottle.
The safer alternative many experts prefer? Lemongrass is sometimes suggested as a gentler swap for lemon or other citrus oils, which are considered more problematic for pets. But “less risky than citrus” is not the same as “risk-free.”
How to Use Lemongrass Essential Oil More Safely Around Dogs
If you decide to use lemongrass oil in a home you share with a dog, a few precautions can significantly reduce the risk.
- Talk to your veterinarian first. This is the single most important step, particularly if your dog is very young, elderly, pregnant, or has an existing medical condition. If your regular vet isn’t experienced with essential oils, they can often refer you to someone who is.
- Never let your dog ingest it. Keep bottles sealed and stored well out of reach of curious noses and paws.
- Dilute heavily. Concentrated oil is where most trouble starts. Never use it at full strength.
- Skip direct topical use unless your vet recommends it. If you do apply it, the base of the neck keeps it away from your dog’s tongue.
- Diffuse only in well-ventilated areas. Always give your dog the freedom to leave the room. If the scent seems to bother them, that’s your cue to stop.
- Watch your dog closely. Any change in behavior after using oils is a signal that something may be wrong.
- Avoid using oils on your own skin if your dog likes to lick you. Residue transfers easily.
What to Do If Your Dog Is Exposed
Accidents happen. If your dog swallows lemongrass oil, gets a concentrated amount on their skin, or shows any of the warning signs above, don’t wait to see if it passes.
Move your dog to fresh air right away, and don’t try to make them vomit. Because oils are viscous, inducing vomiting raises the risk of the oil being aspirated into the lungs, which can lead to aspiration pneumonia. Instead, call for professional guidance immediately.
Keep these numbers handy:
- ASPCA Animal Poison Control Center: (888) 426-4435
- Pet Poison Helpline: (855) 764-7661
You can also head straight to your veterinarian or the nearest emergency animal clinic. When you call, be ready to share what your dog was exposed to, how much, and how long ago.
The Bottom Line on Lemongrass Oil and Dogs
Lemongrass essential oil isn’t among the most dangerous oils for dogs, but it isn’t harmless either. The ASPCA classifies the lemongrass plant as toxic, ingestion can cause vomiting and diarrhea, and a dog’s heightened senses make them far more sensitive to exposure than we are.
If you love the scent and want to keep using it, the safest path is caution: dilute heavily, never allow ingestion, diffuse only in open, ventilated spaces, and watch your dog for any reaction. Above all, loop in your veterinarian before making it part of your routine. They know your dog’s health history and can give advice tailored to your specific situation.
Your home should feel calm and safe for everyone in it, four legs included. A quick conversation with your vet is the simplest way to enjoy the benefits of aromatherapy without putting your best friend at risk.