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Is Mountain Grape toxic to cats?

NO (NON-TOXIC)
Good news, Mountain Grape is a cat safe plant! While this plant is non-toxic, it may still irritate your cat's tummy and potentially cause vomitting or diarrhea if ingested.
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Additional Names:Oregon Grape, Oregon Grape Holly, Mahonia Aguifolium, Holly-Leaved Berry, Mahonia
Scientific Name:Mahonia aquifolium
Family:Berberidaceae
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is Mountain Grape Toxic to Cats?

Cats are curious animals that tend to nibble on plants and fruits. As a cat owner, it’s important to ensure that whatever your furry friends nibble on is not harmful. One particular plant that many cat owners wonder about is the mountain grape or the Oregon grape (Mahonia aquifolium). In this article, we will explore whether mountain grape is toxic to cats and what effects it can have on their health.

What is Mountain Grape?

Mountain grape, also known as Oregon grape, is a shrub that is native to western North America. It is often cultivated as an ornamental plant for its yellow flowers and blue-black berries, which resemble small grapes. The plant is also used in traditional medicine for its antibacterial and anti-inflammatory properties.

Is Mountain Grape Toxic to Cats?

There is no clear evidence that mountain grape is toxic to cats. However, the plant contains several compounds that can be harmful to pets in large quantities. These compounds include berberine, oxycanthine, and other alkaloids. Berberine is known to cause gastrointestinal distress, lethargy, and jaundice in some animals.

Although mountain grape is not toxic to cats, it is recommended to keep your cats away from the plant, as they may still develop mild gastrointestinal symptoms if they ingest a large amount of plant material. The berries and leaves of the plant are the most toxic parts, so it’s best to keep them out of your cat’s reach.

What Are the Symptoms of Mountain Grape Poisoning in Cats?

If your cat ingests mountain grape, you may notice the following symptoms:

  • Vomiting
  • Diarrhea
  • Lethargy
  • Loss of appetite
  • Jaundice (yellowing of the eyes and mucous membranes)
  • Increased thirst

If you suspect that your cat has ingested mountain grape, it’s important to contact your veterinarian immediately. Your vet may recommend inducing vomiting to prevent absorption of the toxic compounds or administering medications to treat the symptoms.

How to Keep Your Cat Safe from Mountain Grape Poisoning

To ensure that your cat stays safe from mountain grape poisoning, it’s important to take the following precautions:

  • Avoid planting mountain grape in areas where your cat can reach it
  • Keep your cat indoors to prevent exposure to toxic plants
  • Monitor your cat closely when outdoors
  • Train your cat to avoid plants that are off-limits
  • Provide plenty of cat-safe toys and distractions to keep your cat occupied

Conclusion

Although mountain grape is not toxic to cats, it’s best to keep your feline friends away from the plant to avoid any mild gastrointestinal symptoms. The berries and leaves of the plant are the most toxic parts, and it’s essential to keep them out of your cat’s reach. If your cat ingests mountain grape, contact your veterinarian immediately for prompt treatment. With proper precautions, you can ensure that your furball stays safe and healthy.

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