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Toxic to dogs. The ASPCA lists mint (garden mint) as toxic to dogs. Low tier and amount dependent. Small tastes are a watch and learn; a grazed bed, repeated vomiting or diarrhea, or a small dog with a big appetite for the patch means a call for advice.
Mint is the herb that escapes: planted once, it runs under fences and through beds, perfuming every path edge in the garden. It flavors teas, garnishes plates and stands in pots by every kitchen door. The ASPCA lists garden mint as toxic to dogs, which surprises nearly everyone, and its own entry supplies the proportion: the signs belong to large ingestions. This page is about managing a vigorous plant, not fearing a leaf.
Look for square stems (the mint family's signature), toothed oval leaves in opposite pairs with a clean mint scent when rubbed, and a spreading, running habit that ignores bed edges. Garden mints sold for cooking are Mentha species and hybrids; the ASPCA entry covers the genus. Ornamental and wild mints share the frame, so identify by square stem plus scent plus spread.
The ASPCA names the toxic principle of mint (garden mint) as Essential oils. Mint leaves carry their scent as essential oils, and in quantity those oils are gut irritants. The ASPCA entry is short and dose based: vomiting and diarrhea with large ingestions. That wording is the whole calibration for this page. A dog brushing through a mint patch or stealing a leaf is in garnish territory; a dog that grazes a mint bed down, or drinks from a pot of concentrated mint preparation, has eaten the large ingestion the entry is about.
The clinical signs the ASPCA lists for mint (garden mint) are: vomiting and diarrhea with large ingestions. The realistic exposure is grazing, because mint invites it: soft, scented, low and unlimited. Dogs that crop grass along borders take mint in mouthfuls, and the first clue is mint smelling vomit on the path, an oddly diagnostic detail worth passing to the veterinarian. The other route is the kitchen pot on a windowsill that gets moved to the floor for watering and forgotten there, at the height of a curious puppy.
Most dangerous part: The leaves eaten in bulk from a bed or a big patio pot. Mint spreads so aggressively that a single planting can offer a dog an unlimited grazing supply at ground level all season.
Do not let this mild entry blur the essential oil line. Mint flavored products, and especially concentrated essential oils sold in bottles, are not the plant, and oil exposures are stronger and different; name the product on any call. Pennyroyal, a mint relative with a genuinely dangerous oil, is a different plant and a different risk.
Call your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 right away, even if your dog looks fine. Some poisons take hours or days to show their worst effects. Do not make your dog vomit unless a veterinarian tells you to, and keep the packaging, a photo, or a sample of what was eaten to show the clinic.
Contain mint in pots on stands or in a fenced herb bed if your dog grazes, rather than letting it run through dog territory. That containment is good gardening anyway. Sweep up prunings and pulled runners the day you thin the patch, because a wilted pile of mint is still a pile of mint to a dog.
For a scented, spreading groundcover in a dog area, select from plants the ASPCA lists as non-toxic to dogs and verify by scientific name. Herbs as a group need checking one by one: this database lists several, in both directions, which is the lesson mint teaches best. Whatever you plant next, check it on the toxic plants index approach: confirm the plant on the ASPCA toxic and non-toxic list under its scientific name, Mentha sp. is the name to avoid here, before it goes in the ground or on the shelf.
Yes. The ASPCA lists mint (garden mint) (Mentha sp.) as toxic to dogs. Its toxic principle is Essential oils, and the signs it lists include vomiting and diarrhea with large ingestions.
Call your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. Note what part of the plant was eaten and roughly how much, keep any remaining plant material to show the clinic, and do not make your dog vomit unless a veterinarian tells you to.
The leaves eaten in bulk from a bed or a big patio pot. Mint spreads so aggressively that a single planting can offer a dog an unlimited grazing supply at ground level all season.
Almost certainly not from one leaf. The ASPCA ties vomiting and diarrhea to large ingestions. Watch the dog, keep it off the patch, and call for advice only if it ate a great deal or signs develop.
Not as a garden remedy. Breath treats made for dogs are formulated and portioned; garden mint is an unmeasured dose of a listed plant. If bad breath is the problem, it is also a dental symptom worth a veterinarian's look rather than an herb's cover up.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog has eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines.
Last updated: November 2026. Every verdict on this page was checked against the sources listed above. How we work: our methodology.
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