Essential oils and pet rodents: rats, mice and guinea pigs

Essential oils and pet rodents: rats, mice and guinea pigs

Daniel Smith

If you keep rats, mice or guinea pigs and also enjoy essential oils at home, the main thing to think about is exposure.

Small animals often spend much of their time in an enclosure. They cannot always move away from a strong fragrance, airborne mist or spill in the way a dog or cat might. Their size also matters when concentrated products are involved.

There is no reliable Australian list of essential oils that can be labelled safe for every rat, mouse or guinea pig. The oil itself matters, but so do the concentration, amount, method of exposure and the individual animal.

We do not currently have complete pet safety information for every product stocked by Essential Oils QLD. If you do not see a rodent specific warning on a product page, that does not mean we have assessed the product as safe for rats, mice or guinea pigs.

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Which animals does this guide cover?

This guide focuses on rats, mice and guinea pigs commonly kept as companion animals in Australia.

Guinea pigs are rodents, even though their care and biology differ considerably from rats and mice.

Rabbits are not rodents. They belong to a different group called lagomorphs. There is also an important legal distinction for our Queensland readers: rabbits cannot legally be kept as pets in Queensland. Limited permits exist for purposes such as research and public exhibition.

What about hamsters?

Hamsters are rodents, but they are not a normal Australian pet category.

The Australian Department of Agriculture, Fisheries and Forestry states that only dogs, cats, rabbits, horses and selected species of birds from approved countries can currently be imported into Australia as pets. No other vertebrate animals are approved for pet import.

Hamsters are dealt with separately under Australia's laboratory animal import arrangements. Live laboratory animals require an import permit, and the current laboratory animal arrangements specifically include hamsters as well as guinea pigs, rats and mice.

For that reason, this guide does not attempt to provide household pet advice for hamsters. It focuses on rats, mice and guinea pigs.

Why enclosure living changes the situation

A dog can often walk out of a room if it dislikes a smell. A rat in a cage cannot.

Where you place a diffuser therefore matters. So does ventilation. Mist or residue can also settle on bedding, food bowls, cage surfaces or fur, creating another possible route of exposure.

This does not mean that owning a small pet rules out using essential oils elsewhere in your home. It means their enclosure should be treated as their living space and kept away from concentrated fragrance, spills and essential oil residue.

Rats need particular care around respiratory irritants

Respiratory disease is one of the most common health problems seen in pet rats.

RSPCA Australia explains that irritation from dust, ammonia and aromatic oils such as pine and cedar can damage the lining of a rat's respiratory tract. This can contribute to the chronic respiratory disease seen in rats.

RSPCA Australia also recommends well ventilated rat enclosures because ammonia from urine can build up quickly and irritate the respiratory system.

This gives us a good reason to keep essential oil mist and strong fragrance out of a rat's enclosure. It does not mean every essential oil has been proven toxic to rats, and we do not think it is useful to make that leap.

What about mice?

Mice also need a clean living environment with appropriate ventilation.

We have not found a reliable Australian veterinary source that provides a list of essential oils proven safe to diffuse around pet mice. Rather than inventing one, our advice is to keep concentrated oils, diffuser mist and strong fragrance away from their enclosure.

Pay particular attention to anything a mouse could chew, lick or walk through. Their enclosure, bedding, food and drinking water should stay free from essential oil residue.

What about guinea pigs?

Guinea pigs have their own husbandry and health needs, so they should not simply be treated as bigger mice or smaller rabbits.

RSPCA Australia recommends clean enclosures and appropriate bedding for guinea pigs and notes that they are very sensitive to ammonia from urine. Regular cleaning helps prevent respiratory and skin problems.

We have not found enough Australian evidence to create a credible list of essential oils that are safe for guinea pigs.

Keep essential oils, diffuser liquid and scented residue away from their enclosure, bedding, food and water.

How could a rat, mouse or guinea pig be exposed?

Exposure does not only happen when an oil is deliberately given to an animal. Accidents and residue matter too.

A small pet could be exposed by:

  • swallowing essential oil or diffuser liquid
  • licking a spill or contaminated surface
  • walking through oil and later grooming its feet or fur
  • having concentrated oil applied to its skin or coat
  • eating food or drinking water contaminated with oil
  • breathing concentrated vapour or airborne droplets

The Australian Animal Poisons Helpline advises that swallowing concentrated essential oils carries the greatest poisoning risk. Concentrated oils on the skin can also cause toxicity.

Exposure to fumes from a diffuser or burner is generally considered lower risk than swallowing concentrated oil or having it applied directly to the skin. That does not make diffuser exposure risk free. High concentrations or prolonged exposure can still make companion animals unwell.

Can I use a diffuser if I have rats, mice or guinea pigs?

We have not found an Australian evidence based rule that says a particular number of drops or a particular running time is safe for rats, mice or guinea pigs.

If you choose to use a diffuser elsewhere in a home with small pets:

  • keep it away from the enclosure
  • do not position it above the enclosure
  • do not direct mist towards the animal
  • keep the room well ventilated
  • do not allow a strong fragrance to build up around the enclosure
  • keep the diffuser and its liquid securely out of reach
  • keep oils away from food, water and bedding
  • stop using the diffuser around the animal if it appears uncomfortable or unwell

Remember that an animal in an enclosure may not be able to get away from the source. Moving the diffuser a little further along the same shelf is not the same as giving the animal clean air.

Keep essential oils out of the enclosure

Essential oils should not be added to:

  • bedding or nesting material
  • substrate
  • food
  • drinking water
  • toys
  • hides or shelters
  • cage bars or other enclosure surfaces

We also do not recommend using essential oils as a cage deodoriser.

If you spill an oil inside or near an enclosure and think the animal may have come into contact with it, remove access to the contaminated area and seek veterinary or poison advice where appropriate.

Do not apply concentrated oils directly to small pets

Do not put concentrated essential oil on the skin, fur, feet, ears or face of a rat, mouse or guinea pig.

These animals groom themselves. Oil that gets onto fur or feet can end up being swallowed later.

If your veterinarian recommends a treatment for your animal, follow the veterinarian's directions and use the product they recommend.

Are some essential oils safer than others?

This is where the available information becomes less certain.

We have not found enough Australian veterinary evidence to publish lists headed "safe for rats", "safe for mice" or "safe for guinea pigs".

We also do not take a list developed from poisoning reports involving dogs or cats and automatically apply it to every rodent species. That would give the list more certainty than the evidence supports.

Where we have reliable product specific information about an animal safety concern, we may show it on the individual product page. If there is no warning, that does not prove the oil is safe.

Why do pine and cedar get a specific mention?

Pine and cedar are different because we have Australian guidance that specifically discusses them in relation to rats.

RSPCA Australia identifies aromatic oils including pine and cedar as respiratory irritants that can damage the lining of a rat's respiratory tract.

That is relevant when choosing bedding and other materials for a rat enclosure, and when deciding whether to introduce fragranced products around the animal's living area.

It does not mean that every trace of pine or cedar automatically causes poisoning. The evidence supports avoiding these aromatic oils as respiratory irritants around rats, rather than turning them into a universal toxicity rule for every rodent.

Signs that something may be wrong

There is no single set of symptoms that proves an essential oil caused a problem. Small animals can become unwell for many reasons.

Changes worth taking seriously include:

  • unusual quietness or reduced activity
  • weakness
  • loss of appetite
  • changes in normal behaviour
  • sneezing or unusual breathing sounds
  • rapid or laboured breathing
  • poor balance or coordination
  • tremors
  • seizures
  • collapse

Rats with respiratory disease may show sniffling, sneezing, clicking sounds, laboured breathing or red staining around the eyes and nose.

Those signs are not unique to essential oil exposure. If your animal becomes unwell, particularly if its breathing changes, seek veterinary advice rather than trying to work out the cause at home.

What to do after a suspected exposure

If your rat, mouse or guinea pig swallows an essential oil, accesses diffuser liquid, gets concentrated oil on its body or becomes unwell after a possible exposure:

  1. Stop any further exposure where you can do so safely.
  2. Remove contaminated food, water or bedding.
  3. Try to prevent further licking or ingestion.
  4. Do not induce vomiting or give a home remedy unless a veterinarian or poison specialist tells you to.
  5. Keep the bottle, label and ingredient information nearby.
  6. Contact a veterinarian experienced with small mammals or the Australian Animal Poisons Helpline.

Does "pure" or "natural" mean safe for rodents?

No. Those words describe characteristics of a product. They do not tell you whether an animal can safely swallow, inhale or have contact with it.

Essential oils are concentrated plant extracts. An oil can be completely natural and still contain compounds that are unsuitable for an animal at a particular concentration or level of exposure.

We therefore do not use terms such as "pure" or "natural" as evidence that an oil is safe for rats, mice or guinea pigs.

Essential oils are not veterinary treatments

Essential Oils QLD sells essential oil products for their labelled human uses unless a product is specifically authorised and labelled for animal use.

We do not recommend using these products to treat respiratory disease, skin problems, parasites, infection, pain, stress, anxiety or other health or behavioural conditions in rats, mice or guinea pigs.

If your small pet has a health problem, speak with a veterinarian experienced with that species.

Using essential oils in a home with small pets

Having rats, mice or guinea pigs does not automatically mean you cannot own or enjoy essential oils.

Keep concentrated oils and diffuser liquid away from them. Keep the enclosure free from oil residue and strong fragrance. Make sure there is good ventilation, and take extra care with spills because these animals spend so much time close to their bedding, food and enclosure surfaces.

We are progressively adding pet awareness information to our product pages where useful information is available. If you do not see product specific information, it means we do not currently have enough reliable information to make a product specific statement. It should not be read as either a safety guarantee or a warning that the product cannot be kept in a home with small pets.

Australian references

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