Mint Poisoning in Dogs
Written By hannah hollinger
Published: 10/13/2016Updated: 06/03/2021
Veterinary reviewed by Michele K.
Mint Poisoning in Dogs - Signs, Causes, Diagnosis, Treatment, Recovery, Management, Cost
What is Mint Poisoning?
Essential oils and aromatherapy have become increasingly popular over the years. Many of these oils are safe and beneficial to use on dogs; it is a very natural approach to healing. But before you use any essential oil on your dog, you need to do your research first. Not all oils are safe for dogs, mint being one of them. If you applied a mint essential oil on your dog, he may develop symptoms of toxicity and with some mint species, he may develop liver failure. Wash the oil off your dog with a detergent type of soap as soon as possible and get him to a veterinarian. If corrected early enough, his prognosis of recovery is good.
Mint is a common aromatic ingredient used in many products. In the form of an essential oil, it is extremely toxic to your dog. If your dog has been around mint and is now acting abnormally, contact your veterinarian.
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Mint Poisoning Average Cost
From 566 quotes ranging from $200 - $2,000
Average Cost
$500
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Symptoms of Mint Poisoning in Dogs
Symptoms of mint poisoning may vary from dog to dog. Symptoms may include:
  • Lethargy
  • Vomiting
  • Diarrhea
If your dog ingests pennyroyal mint, he can also experience liver failure. 
Types
Mint, also known as garden mint, belongs to the Lamiaceae family with the scientific name of Mentha spp. The two most common types of mint include peppermint and spearmint. There are about 25 different species of mint and are characterized by their aromatic property.  This herb does well in cool, moist areas with partial shade or full sun.
Causes of Mint Poisoning in Dogs
The essential oils of the mint plant are what are toxic to your dog. It is too strong for them and when applied to their coat or skin or comes into contact with them in any way, they develop signs of toxicity. Some people use this essential oil on their dog safely but in its diluted form or with a carrier oil. If not diluted properly, your dog can suffer severe consequences.
Diagnosis of Mint Poisoning in Dogs
Symptoms of mint poisoning are very vague; many things can cause the listed signs. There are a number of diagnostic tests the veterinarian may need to perform to come to a proper diagnosis. However, if you are able to bring a piece of the plant or the oil you used, it will allow for a quicker and error free diagnosis.
When you first arrive at the clinic, the veterinarian will begin by collecting a history from you. She will want to know any and all details of what your dog possibly could have come into contact with within the past 24 hours, either accidental or anything new you used on or near him. 
She will perform a physical exam on your dog to check his vitals and note any other signs he may be experiencing. This will also allow her to take a thorough look over your dog to evaluate his signs. She may decide to do some blood work for multiple reasons. One, it will give her needed information on how your dog’s internal organs are functioning, especially since liver failure is a concern, and two, it will help her to rule out other possible causes of your dog’s signs. A complete blood count (CBC) and chemistry panel are usually the first tests to be run; it will give the veterinarian a status check of your dog’s major blood filtering organs like the liver and kidneys. If your dog is vomiting and having diarrhea excessively, she may run a packed cell volume (PCV) to determine the severity of dehydration he is experiencing. Depending on the preliminary results, your veterinarian may choose to run more diagnostic tests for further evaluation.
Treatment of Mint Poisoning in Dogs
The signs your dog is experiencing will determine his course of treatment. If his blood work comes back with abnormal values, or liver failure is possible, he will immediately be started on fluid therapy. Vitamin B may be added to his fluids to give his immune system the extra boost it needs to recover. The fluids will flush the toxin from his system in the most efficient and safest way possible. Also, the fluid therapy will correct any dehydration he may be experiencing or prevent it from developing.
Depending on the method of interaction your dog came into contact with the mint, his treatment may vary. If he ingested something with the oil on it or licked it off something, she may attempt to induce vomiting, depending on the timing. This will rid your dog’s stomach of any remaining amount before the body absorbs it. If too much time has passed since ingestion and induction of vomiting is unsuccessful, she may administer activated charcoal. This will help bind and neutralize the toxins of the mint before the body absorbs it. If your dog is vomiting continuously, an antiemetic will be given to help stop the vomiting and to offer your dog some relief. If your dog developed a reaction after the mint oil was applied to his coat or body, the veterinarian will immediately have him bathed with a mild detergent to remove as much as the oil as possible. 
If your dog has stopped vomiting and seems to be feeling better but still isn’t eating, the veterinarian may prescribe an appetite stimulant to get him interested in food again. She may want to keep your dog overnight to monitor his symptoms and continue administration of supportive therapies. Once he is feeling better, his lethargy should subside and should be ready to go home.
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Recovery of Mint Poisoning in Dogs
The use of essential oils on your dog can be beneficial. It might help to avoid over medicating your dog and substituting a pharmaceutical product for a more natural one. However, do not use any oil without proper guidance. Poisoning from mint in dogs may range from mild to severe. If you believe your dog is having a reaction to mint, the sooner you get him to a veterinarian, the higher his prognosis of a full recovery. If your dog is only suffering mild signs such as gastrointestinal upset, his recovery should go well with the help of supportive therapies.
If your dog is experiencing liver failure, the prognosis for a full recovery declines greatly. Once the liver is in full failure, there is no cure, and some dogs do not respond to therapy. However, in some cases, if the veterinarian is able to catch it soon enough she can administer medications and therapies to stop it from progressing. Any damage the liver experiences may not heal entirely, but there are medications you can give your dog to promote healthy liver function. 
Mint Poisoning Average Cost
From 566 quotes ranging from $200 - $2,000
Average Cost
$500
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Mint Poisoning Questions and Advice from Veterinary Professionals
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Pit Bull
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dog-age-icon
Seven Years
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35 found this helpful

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35 found this helpful

My pet has the following symptoms:
N/A
He just ate some peppermint oil, will he be okay?? I would say it was maybe a teaspoon or 1 1/2 teaspoons worth.
Aug. 19, 2020
Answered by Dr. Sara O. DVM
35 Recommendations
Hello, This isn't really toxic but can cause GI issues such as vomiting or diarrhea. If you notice any of these issues, it would be best to take your dog to your vet. They will be able to treat any issues that your dog may be showing from eating the peppermint oils.
Aug. 19, 2020
Was this question and answer helpful?
dog-breed-icon
Pit Bull
dog-name-icon
dog-age-icon
Seven Years
thumbs-up-icon

9 found this helpful

thumbs-up-icon

9 found this helpful

My pet has the following symptoms:
N/A
He just ate some peppermint oil, will he be okay?? I would say it was maybe a teaspoon or 1 1/2 teaspoons worth.
Aug. 19, 2020
Answered by Dr. Sara O. DVM
9 Recommendations
Hello, This isn't really toxic but can cause GI issues such as vomiting or diarrhea. If you notice any of these issues, it would be best to take your dog to your vet. They will be able to treat any issues that your dog may be showing from eating the peppermint oils.
Aug. 19, 2020
Was this question and answer helpful?
dog-breed-icon
Pit Bull
dog-name-icon
dog-age-icon
Seven Years
thumbs-up-icon

9 found this helpful

thumbs-up-icon

9 found this helpful

My pet has the following symptoms:
N/A
He just ate some peppermint oil, will he be okay?? I would say it was maybe a teaspoon or 1 1/2 teaspoons worth.
Aug. 19, 2020
Answered by Dr. Sara O. DVM
9 Recommendations
Hello, This isn't really toxic but can cause GI issues such as vomiting or diarrhea. If you notice any of these issues, it would be best to take your dog to your vet. They will be able to treat any issues that your dog may be showing from eating the peppermint oils.
Aug. 19, 2020
Was this question and answer helpful?
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Maltese
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dog-age-icon
Two Months
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10 found this helpful

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10 found this helpful

My pet has the following symptoms:
Drowsy
Inhaled peppermint oil
July 24, 2020
Answered by Dr. Sara O. DVM
10 Recommendations
Hello, If your dog is showing symptoms of toxicity, it would be best for her to be seen. Small dogs can be very sensitive to these things and would need to see a vet right away.
July 24, 2020
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Chihuahua
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Hiindu, Puff
dog-age-icon
8 Years
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18 found this helpful

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18 found this helpful

My pet has the following symptoms:
None
I made a bottle of spearmint (3 drops) to a spray bottle of water and used it on the carpets, will this harm my two small dogs? It accidentally got on their backs as well but only one or two sprays. I they had fleas and I read that spraying peppermint or spearmint on the carpets could ward the fleas away or kill them. I'm just worried about my dogs.
Aug. 17, 2018
Answered by Dr. Michele K. DVM
18 Recommendations
That small amount of peppermint oil should not be harmful to Hindu and Puff, but if you are going to continue to use it, it would be best to use it while they are not in the room.
Aug. 18, 2018
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Pin-Pom
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Ella
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1 Year
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0 found this helpful

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0 found this helpful

My pet has the following symptoms:
None
Energetic
So we have a rat in the house and I read that peppermint oil would help get rid of them. I did a couple drops around my bed because that’s where I heard it last night. The smell has taken over the house! Then I read how toxic it is to dogs and now I’m freaking out. My dog Ella is about 7-8lbs and she was sick the past 2 weeks. She was coughing, sneezing, and she wouldn’t eat. After I did the peppermint oil she stopped coughing and sneezing and she’s really energetic. I just gave her a bath in dawn dish soap. Should I be concerned?
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Chihuahua
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Quinoa
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6 Months
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0 found this helpful

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0 found this helpful

My pet has the following symptoms:
Vomiting
My 4lbs chihuahua was in our bedroom after a bath, and we had the dry sauna heating up in our room as well. We had a dish of essential oils in the sauna and the scent was getting strong. My chihuahua was getting cuddles and love and relatively calm. Then all of a sodden he vomited. I took him out of our bedroom right away, and is now sleeping on me downstairs. Should I rush him to the vet?
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Pembroke Welsh Corgi
dog-name-icon
Theo
dog-age-icon
2 Years
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0 found this helpful

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0 found this helpful

My pet has the following symptoms:
Vomiting
Theo (2.5 year-old, 33 lbs) has been vomiting sporadically of late after being fine since we got him in February. At first we assumed it was food related (we give him the same dry food, but we mix in a spoonful of canned that we vary (to keep him from getting bored). But the more I thought about it, it *may* have coincided with mosquito season. We use a very diluted peppermint oil-in-water spray on us before we go out and sometimes on him when we come back in (more for odors than insect control--he already has a Soresto collar). I usually spray it on myself while he's waiting at my feet by the door. Sometimes he walks away and other times he mostly stays by my side. Again--not after every meal--he'll start licking the floor obsessively and eventually will vomit--anything he ate recently plus a lot of water that he's had. The vet did have us giving him pepcid (7mg) as a preventative before we had a visit, but after seeing a vet she said he was fine so we stopped and decided to "stabilize" what we feed him. He's fine immediately after he vomits. So I am really thinking it could be the peppermint spray. We will stop using it near him and I will report back. But any thoughts on the likelihood based on the symptom?
Mint Poisoning Average Cost
From 566 quotes ranging from $200 - $2,000
Average Cost
$500
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