Is Citronella Safe for Dogs? A Vet-Backed Safety Guide
Is citronella safe for dogs? Learn the risks of citronella plants, oils, and candles for dogs, plus what to do if your dog ingests citronella.
Citronella (Cymbopogon species) is toxic to dogs when ingested. The essential oils within the plant — primarily citronellal, geraniol, and citronellol — can cause gastrointestinal distress, skin irritation, and in severe cases, central nervous system depression. This applies to the living plant, citronella essential oil, citronella candles, sprays, and topical products. There is no safe serving size for dogs. If your dog has consumed any form of citronella, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately.
What Exactly Is Citronella and Why Do Dog Owners Ask About It?
Citronella is a tropical grass belonging to the Cymbopogon genus, most commonly Cymbopogon nardus and Cymbopogon winterianus. It is widely cultivated for its strong lemony fragrance and is a common ingredient in insect-repelling candles, torches, sprays, collars, and essential oil diffusers. Many homeowners grow citronella plants in gardens or on patios as a natural mosquito deterrent.
The confusion about safety often arises because citronella is marketed as "natural" — and many dog owners understandably assume natural equals safe. However, the ASPCA lists citronella as toxic to both dogs and cats. The plant's concentrated essential oils contain compounds that canine livers cannot efficiently metabolize, leading to a range of adverse reactions depending on the dose and route of exposure.
How Citronella Affects Dogs: Symptoms by Exposure Type
Dogs can be exposed to citronella through ingestion (chewing the plant, licking oil off their fur), dermal contact (topical sprays, essential oils applied to skin), or inhalation (diffusers, burning candles in enclosed spaces). Each route carries different risks.
| Exposure Type | Mild Symptoms (1–4 hours) | Severe Symptoms (4–24 hours) |
|---|---|---|
| Ingestion (plant material, oil) | Drooling, vomiting, diarrhea, loss of appetite, abdominal discomfort | Persistent vomiting, lethargy, muscle weakness, hypothermia, collapse |
| Dermal contact (oils, sprays) | Skin redness, itching, localized rash, pawing at face | Chemical burns, blistering, secondary infection from scratching |
| Inhalation (diffusers, candles) | Sneezing, coughing, watery eyes, nasal discharge | Difficulty breathing, wheezing, aspiration pneumonia (if oil is inhaled into lungs) |
Small dogs (under 20 lb / 9 kg) and puppies are at significantly higher risk because their lower body mass means a smaller dose of essential oil compounds reaches toxic blood concentrations. Brachycephalic breeds (French Bulldogs, Pugs, Boston Terriers) face compounded risk from inhalation exposure due to their already compromised airways.
Citronella Products Dogs Encounter: Risk Breakdown
Not all citronella exposure is equal. Here is how different product forms rank in danger level for dogs:
- Citronella essential oil (highest risk): Highly concentrated — even a few drops ingested or applied to skin can cause serious toxicity. Diffusing this oil in rooms where dogs spend time poses inhalation risk.
- Citronella candles and torches (moderate risk): The burning process disperses small amounts of citronellal into the air. While brief outdoor exposure is unlikely to cause acute poisoning, dogs who chew or lick a cooled candle face concentrated ingestion risk plus wax-related intestinal blockage.
- Citronella anti-bark collars (moderate risk): These spray a burst of citronella-scented liquid near the dog's face. The spray can cause skin and eye irritation, and dogs may ingest the liquid by licking their fur afterward. Many certified dog trainers and behaviorists advise against these collars because the aversive spray can increase anxiety and does not address the underlying cause of barking. The AVMA supports positive reinforcement-based training methods as more effective and humane alternatives.
- Citronella plants in gardens (moderate risk): Dogs who chew on the grass-like leaves can ingest enough essential oil to cause GI upset. The fibrous plant material can also cause mechanical irritation.
- Citronella-based topical repellents (variable risk): Products labeled for dogs may contain diluted citronella, but individual sensitivity varies widely. Even "dog-safe" formulations can trigger allergic dermatitis in sensitive animals.
What to Do If Your Dog Eats or Is Exposed to Citronella
- Your dog ingests citronella essential oil (any amount)
- Vomiting or diarrhea persists beyond 12 hours
- Your dog shows lethargy, tremors, or difficulty walking
- Labored breathing, wheezing, or persistent coughing develops
- Skin blistering or open sores appear after topical contact
- Your dog is under 6 months old or weighs less than 10 lb (4.5 kg) and has had any exposure
ASPCA Animal Poison Control: (888) 426-4435 (24/7, consultation fee applies)
Pet Poison Helpline: (855) 764-7661 (24/7, consultation fee applies)
For mild skin exposure, wash the affected area with lukewarm water and a gentle, fragrance-free dog shampoo (such as Earthbath Oatmeal & Aloe or Burt's Bees Hypoallergenic). Do not use human dish soap or hand sanitizer, as these can further irritate canine skin. Monitor for 24–48 hours for delayed reactions.
For ingestion of plant material (not concentrated oil), your veterinarian may advise monitoring at home for mild symptoms. Do not induce vomiting unless explicitly instructed by a veterinarian — essential oils can cause aspiration pneumonia if vomited back up into the lungs.
Diagnostic Tests and Treatment Costs at the Vet
If you bring your dog in for citronella toxicity, here is what to expect during the visit and approximate 2026 cost ranges:
| Service | Purpose | Estimated Cost (USD) |
|---|---|---|
| Emergency exam fee | Initial assessment, vitals, history | $75–$150 |
| Blood chemistry panel (CBC + chemistry) | Check liver enzymes (ALT, AST), kidney function, electrolytes | $120–$250 |
| IV fluid therapy | Support hydration, flush toxins, protect kidneys | $80–$200 per session |
| Anti-emetic injection (maropitant/Cerenia) | Control vomiting | $30–$65 |
| Activated charcoal (if within 2 hours of ingestion) | Bind remaining toxins in GI tract | $25–$50 |
| Overnight hospitalization (severe cases) | Continuous monitoring, repeated treatments | $500–$1,500+ |
Most mild ingestion cases resolve within 24–48 hours with supportive care. Severe essential oil poisoning may require 2–3 days of hospitalization. According to the Merck Veterinary Manual, prognosis for essential oil toxicity is generally favorable with prompt veterinary intervention, but delayed treatment can lead to hepatic damage or aspiration pneumonia.
Dog-Safe Alternatives to Citronella for Insect Repellent
If you use citronella primarily for mosquito and insect control, several dog-safe alternatives exist:
- For your yard: Plant rosemary, basil, or marigolds as natural insect deterrents. These are non-toxic to dogs according to the ASPCA and provide similar aromatic pest control without the toxicity risk.
- For your dog's coat: Look for veterinary-recommended spot-on preventives (such as K9 Advantix II or Frontline Plus) that address fleas, ticks, and mosquitoes without essential oil exposure. Expect to pay $40–$65 for a 4-month supply.
- For outdoor patios: Use a fan — mosquitoes are weak fliers and a simple oscillating fan on a patio reduces mosquito presence by up to 65% without any chemical exposure.
- For training (anti-bark): Instead of citronella spray collars, work with a certified professional dog trainer (CPDT-KA) who uses positive reinforcement and counter-conditioning to address excessive barking at its root cause. Sessions typically cost $60–$120 per hour.
Related Plants and Products to Keep Away From Dogs
If you are managing citronella exposure, be aware of these related toxic plants and products commonly found in homes and gardens:
- Lemongrass (Cymbopogon citratus): A close relative of citronella with similar essential oil compounds. Also toxic to dogs if ingested.
- Citronella-scented geraniums (Pelargonium citrosum): Often sold as "citronella plants" at garden centers. Geraniums are toxic to dogs and can cause vomiting, depression, and dermatitis.
- Tea tree oil (melaleuca): Another essential oil frequently used in "natural" pet products. Highly toxic to dogs even in small amounts — as little as 7 drops of 100% tea tree oil has caused severe poisoning.
- Eucalyptus oil: Commonly found in chest rubs and diffusers. Toxic to dogs via ingestion and inhalation.
- Pennyroyal oil: Sometimes used in flea sprays. Extremely toxic — can cause liver failure and death even at low doses.
Always consult your veterinarian before introducing any new plant, essential oil product, or topical treatment into your dog's environment. What is safe for human use is not automatically safe for canine physiology — dogs metabolize many aromatic compounds through different liver pathways than humans do.
Frequently Asked Questions
Can dogs eat citronella?
No. Citronella is toxic to dogs in all forms — the plant, essential oil, candles, and sprays. There is no safe serving size. If your dog chews on a citronella plant or licks citronella oil, contact your veterinarian.
Is the smell of citronella candles harmful to dogs?
Brief outdoor exposure to citronella candle smoke is unlikely to cause acute poisoning in healthy adult dogs. However, burning citronella candles or using essential oil diffusers in enclosed indoor spaces can irritate a dog's respiratory tract, especially in brachycephalic breeds or dogs with pre-existing conditions like kennel cough or canine asthma.
Are citronella anti-bark collars safe?
While citronella anti-bark collars are commercially available, they carry risks of skin irritation, eye exposure, and accidental ingestion when dogs lick the sprayed area. More importantly, they do not address the behavioral cause of barking and can increase anxiety. Positive reinforcement training methods are recommended by veterinary behaviorists as a safer and more effective long-term solution.
My dog licked a citronella candle — should I panic?
Don't panic, but do take action. Note how much was consumed and whether any wax was swallowed (which poses a blockage risk). Call your veterinarian for guidance. For small amounts of residue licked off a surface, monitoring at home for vomiting, diarrhea, and lethargy over the next 24 hours may be sufficient — but your vet should make that determination based on your dog's size and health status.
Is citronella toxic to puppies more than adult dogs?
Yes. Puppies have immature liver enzyme systems and lower body weight, making them significantly more vulnerable to essential oil toxicity. Even small exposures that might cause only mild GI upset in an adult dog can produce more severe symptoms in puppies under 6 months of age. Keep all citronella products completely out of reach of puppies.
Beth Carrasco
All our authors care for dogs every day — read more of their work on the authors page.
