Quick answer: Citronella oil is not automatically safe or toxic in every situation. Risk depends on the animal species, oil concentration, formulation, dose, and route of exposure. Concentrated citronella oil should not be applied directly to a dog or cat, added to food, or used as a homemade treatment without veterinary guidance. A recent controlled dog study found no skin irritation from one specific diluted bath formulation, but that result does not prove that pure oil, household sprays, diffusers, candles, or the same formulation are safe for every pet—especially cats.

Citronella oil for pets is a popular search because the ingredient appears in insect repellents, outdoor candles, sprays, shampoos, collars, and household products.

The problem is that these products are not interchangeable.

A pet-labeled wash containing a controlled amount of citronella is very different from undiluted essential oil, torch fuel, or a homemade spray with an unknown concentration.

Citronella is a mixture of volatile compounds obtained from Cymbopogon grasses. Its composition can vary by botanical source, origin, distillation, and batch.

Manufacturers evaluating citronella essential oil therefore need to assess the actual oil specification and complete product formula—not rely on the ingredient name alone.

This article reviews what recent research actually shows, where the evidence is limited, and what pet owners and commercial formulators should consider before using citronella around dogs or cats.

Safety note: This article is educational and is not a diagnosis or a substitute for veterinary advice. If a pet has swallowed citronella oil, has concentrated oil on its coat or skin, or shows abnormal symptoms after exposure, contact a veterinarian or an animal poison-control service promptly. Do not induce vomiting unless a veterinary professional specifically instructs you to do so.

Why Is Citronella Used Around Pets?

Citronella is primarily valued for its odor and insect-repellent properties. In pet-related contexts, it may appear in:

• mosquito, flea, or tick-control products;
• pet shampoos, rinses, sprays, and wipes;
• bark-control or training collars that release a citronella spray;
• outdoor candles, torches, and garden repellents;
• household cleaners, air-freshening products, and diffusers.

The intended use matters. A finished product developed for animals may have a defined concentration, carrier system, application method, and label.

A bottle of concentrated essential oil does not provide those safeguards by itself.

For a broader discussion of accidental swallowing and general exposure, GEO also has a separate guide on whether citronella is toxic if ingested.

This pet-focused article covers a different intent: species-specific risks, product forms, and formulation considerations.

What Recent Research Actually Shows

Recent veterinary research provides useful clues, but it does not support a blanket statement that “citronella is safe for all pets” or “citronella is always toxic.”

The most useful findings are formulation-specific.

Source	What was studied	Main finding	What it does not prove
Uopasai et al., 2024	A bath formulation containing 6% w/w C. nardus oil in 32 healthy dogs; skin observed for 15 days.	No skin irritation was observed; mosquito repellency declined from 100% at 3 hours to 65.58% at 8 hours.	It does not establish safety of pure oil, ingestion, diffusers, sprays, repeated long-term use, or use in cats.
Tadee et al., 2024	Five essential oils, including citronella, tested in vitro against dog ticks and fleas.	Citronella showed insecticidal activity in laboratory tests.	The dog-skin test used Z. limonella and clove oils—not citronella—so it is not direct evidence of citronella skin safety.
EFSA FEEDAP, 2024	C. nardus oil assessed as a sensory feed additive for animal species at defined feed levels.	The assessment set dose-dependent conclusions and identified irritation/sensitization concerns for handling the oil.	Feed-use conclusions cannot be automatically applied to topical products, diffusers, candles, or accidental ingestion.

A 2024 dog study supports one specific diluted formulation—not every citronella product

A 2024 in vivo study published in Veterinary World used 32 healthy mixed-breed dogs.

The treatment group was bathed with a formulation containing 6% w/w C. nardus essential oil.

The dogs were observed for erythema and edema through day 15, and the researchers reported no skin irritation.

The formulation also showed mosquito repellency of 100% at 3 hours, 69.28% at 6 hours, and 65.58% at 8 hours.

This is relevant evidence, but the boundaries are important: the study evaluated a finished bath product, healthy dogs, a single defined concentration, and a limited observation period.

It should not be interpreted as permission to put undiluted citronella oil directly on a pet.

A 2024 parasite study shows activity, but not direct citronella skin-safety data

A Journal of Veterinary Science study tested citronella and four other essential oils against ticks and fleas collected from dogs or cats. Citronella showed laboratory activity against ectoparasites.

However, when the researchers moved to a dog-skin sensitivity test, they selected Zanthoxylum limonella and clove oils—not citronella.

This distinction matters because laboratory efficacy does not automatically establish dermal safety in dogs, and it does not provide evidence of safety in cats.

A 2024 EFSA assessment reinforces that dose and use context matter

The European Food Safety Authority assessed C. nardus oil as a sensory feed additive at defined concentrations.

The panel reached dose- and species-dependent conclusions and also characterized the oil as a potential skin and eye irritant and dermal sensitizer for users handling it.

This assessment concerns controlled feed use, not topical application, airborne exposure, or household products.

It nevertheless supports the broader principle that essential-oil safety must be evaluated by dose, composition, species, and route of exposure.

Is Citronella Oil Safe for Dogs?

For dogs, the most accurate answer is: a properly formulated, pet-labeled product may be tolerated, but concentrated oil and improvised use can create avoidable risk.

Direct skin application

Do not apply neat or undiluted citronella essential oil directly to a dog. Concentrated oil can irritate the skin or eyes, and a dog may lick the treated area and turn a topical exposure into an oral exposure.

The 2024 dog study discussed above does not justify copying its percentage into a homemade recipe; the complete bath formulation, application method, dog selection, and study controls all influenced the result.

Ingestion

Citronella essential oil should not be given orally unless a veterinarian is managing a specific, properly formulated product.

Licking spilled oil, chewing a bottle, drinking diffuser liquid, or ingesting candle or torch products can involve ingredients other than citronella and may require urgent assessment.

Diffusers and airborne exposure

Passive diffusion is not the same as direct application, but it still creates inhalation exposure and the possibility of spills.

Use good ventilation, prevent access to the device and liquid, and stop use if the dog shows coughing, breathing changes, drooling, agitation, lethargy, or other abnormal behavior.

Pet-labeled products

The U.S. Environmental Protection Agency advises consumers not to use an insect-repellent product on pets unless the label clearly states that it is intended for animals. See the EPA guidance on using repellents safely.

Even when a product is labeled for dogs, follow the species, age, weight, frequency, and application instructions exactly.

Is Citronella Safe for Cats?

Citronella should be handled more conservatively around cats. The recent dog studies above cannot be transferred to cats, and they do not establish a safe feline concentration for skin application, ingestion, or diffusion.

Practical precautions for cat households include:

• do not apply concentrated citronella oil directly to a cat or its coat;
• do not use a dog-only citronella product on a cat;
• keep essential-oil bottles, diffuser reservoirs, candles, and torch fuels inaccessible;
• avoid spraying bedding, carriers, scratching areas, or surfaces that a cat may lick unless the finished product is specifically labeled for that use;
• ask a veterinarian before using any citronella-containing product on or near a cat with respiratory, liver, skin, or neurologic disease.

Because controlled, citronella-specific safety data in cats are limited, the responsible conclusion is not “safe at a certain DIY dilution.”

The safer standard is to use only products specifically developed and labeled for cats, with veterinary guidance when needed.

Risk by Citronella Product Type

Product type	Main exposure route	Practical concern	Safer approach
Pure essential oil	Skin, eyes, licking, swallowing	Very concentrated; dose and composition are uncontrolled for pet use.	Do not apply directly or administer orally.
Pet-labeled shampoo or rinse	Topical exposure and licking	Safety depends on the complete formulation and correct use.	Follow the species-specific label and rinse instructions.
Household or garden spray	Inhalation, paws, coat, licking surfaces	May contain solvents, surfactants, or other active ingredients.	Keep pets away during use and until the label allows re-entry.
Diffuser	Inhalation and spilled liquid	Continuous exposure and accessible reservoirs increase risk.	Ventilate; restrict access; discontinue if symptoms occur.
Candle	Smoke, heat, wax or oil ingestion	Burn and fire risk plus accidental ingestion.	Use out of reach in ventilated areas; never leave unattended.
Torch fuel	Swallowing, skin contact, aspiration	Fuel products are not equivalent to cosmetic essential oil.	Store securely and seek urgent veterinary advice after exposure.
Citronella spray collar	Airway, eyes, stress response	Not every dog tolerates the spray or behavioral method.	Use only as labeled and discuss behavior concerns with a qualified professional.

Possible Signs After Exposure

Signs vary with the product, concentration, amount, and route of exposure. General warning signs after essential-oil exposure may include:

• drooling, lip-smacking, vomiting, or diarrhea;
• skin redness, swelling, pawing at the face, or eye irritation;
• coughing, wheezing, rapid breathing, or breathing difficulty;
• lethargy, weakness, unusual agitation, unsteady movement, tremors, or collapse.

The ASPCA notes that concentrated essential oils can cause health concerns when pets walk through them, get them on the coat, or have them applied directly. See the ASPCA overview of essential oils around pets.

If exposure occurs, remove the pet from the source and contact a veterinarian or poison-control service.

Keep the bottle or product label available so the professional can identify the ingredients and concentration.

Do not use online dilution recipes as emergency treatment.

Can Citronella Be Used as a Pet Repellent?

The phrase “citronella pet repellent” can mean two different things:

1. An insect repellent intended to protect a pet from mosquitoes, fleas, or ticks.
2. A product intended to keep dogs or cats away from furniture, gardens, or specific areas.

In both cases, the safest approach is to use a finished product labeled for the intended species and use site.

Do not spray concentrated citronella oil directly on an animal, food bowl, bed, litter area, or frequently licked surface.

A product that is suitable for an outdoor perimeter may not be suitable for pet skin or indoor air.

B2B Formulation Considerations for Pet-Care Manufacturers

For manufacturers, importers, and private-label buyers, the question is not simply whether citronella oil is “natural.”

The commercial safety assessment must cover the raw material, complete formula, target species, dose, exposure route, packaging, and label.

1. Confirm botanical identity and oil type

Cymbopogon nardus and Cymbopogon winterianus oils can differ in chemical profile. The product specification should clearly identify the botanical source, origin, extraction method, and applicable quality parameters. Avoid treating “citronella oil” as one chemically uniform ingredient.

2. Review batch-specific chemical composition

GC-MS data can help formulators review major constituents and batch consistency. Our guide to understanding an essential oil GC-MS report explains why chromatographic data should be interpreted together with the specification and intended application.

3. Define the target species and exposure route

A rinse-off dog shampoo, leave-on spray, collar, room product, and feed additive require different risk assessments. A formula tested in dogs should not automatically be positioned for cats.

Product developers should define age restrictions, body-weight assumptions, application frequency, licking potential, ventilation, and accidental-exposure scenarios.

4. Evaluate the finished formula—not only the essential oil

Carrier oils, solvents, surfactants, preservatives, fragrances, propellants, and packaging can change exposure and tolerability.

Safety cannot be inferred from one ingredient in isolation. Stability testing is also important because evaporation or separation can alter the delivered concentration.

5. Prepare documentation for procurement and regulatory review

Depending on the product and market, buyers may request a Certificate of Analysis, specification sheet, GC-MS profile, Safety Data Sheet, allergen or restricted-substance information, stability data, and evidence supporting the intended label claims. Claims such as “pet-safe,” “non-toxic,” or “veterinarian approved” should not be used without adequate substantiation.

6. Conduct species-appropriate safety and performance testing

Laboratory activity against insects is not enough to prove safety or real-world performance on animals.

Commercial development should include appropriate toxicological review, irritation or sensitization assessment, palatability/licking considerations where relevant, and controlled efficacy testing under applicable regulatory and ethical requirements.

Formulating a citronella-based pet-care or repellent product? Review our citronella essential oil product page and contact our export team to discuss product specifications, available documentation, packaging, samples, and bulk supply requirements. Product suitability for a pet application must be assessed within the customer’s complete formulation and target-market requirements.

Conclusion

Citronella oil for pets is not a simple yes-or-no safety topic. Recent evidence suggests that a carefully designed citronella formulation can be tolerated by healthy dogs under controlled conditions, while other studies show insecticidal potential against ticks and fleas.

However, these findings do not justify direct application of pure oil, homemade sprays, unrestricted diffusion, or extrapolation from dogs to cats.

For pet owners, the practical rule is to use only species-appropriate, labeled products and seek veterinary advice after meaningful exposure.

For B2B formulators, safety depends on botanical identity, batch composition, concentration, route, finished-product testing, documentation, and regulatory positioning.

Frequently Asked Questions