Pet Health

What Herbs Are Toxic to Dogs?

Discover which common herbs are toxic to dogs in our comprehensive guide. Learn to keep your furry friend safe and healthy with this essential information!
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
A dog sniffing a garden with various herbs, highlighting the importance of identifying toxic plants for pets.

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Herbs can add flavor and aroma to our meals, but did you know some common herbs can be dangerous for dogs? Many pet owners unknowingly keep toxic plants in their homes or gardens, putting their furry friends at risk. If you're wondering which herbs to avoid and how to keep your dog safe, you're in the right place. Let's dive into the details.

🩺 Vet Insight

Dogs are naturally curious creatures, and their tendency to sniff, lick, or chew on plants can lead to accidental poisoning. While some herbs are safe and even beneficial for dogs, others can cause mild to severe health issues. The severity of symptoms depends on the type of herb, how much your dog ingested, and their size or overall health.

As a rule of thumb, never assume an herb that’s safe for humans is also safe for dogs. Their digestive systems process foods and plants differently, and some substances that are harmless to us can be toxic to them. This is especially true for herbs with strong chemical compounds or essential oils.

⚠️ Ingredients to Avoid

Here’s a list of herbs that are toxic to dogs and should be kept out of their reach:

  • Garlic: Garlic contains thiosulfate, which can damage red blood cells, leading to anemia. Even small amounts can be harmful (source).
  • Chives: Like garlic, chives are part of the allium family and can cause gastrointestinal upset, drooling, and anemia.
  • Onion: Another allium plant, onions are highly toxic to dogs and can cause vomiting, diarrhea, and lethargy.
  • Parsley (large amounts): While small quantities are safe, excessive parsley contains furanocoumarins, which can cause photosensitivity and toxicity in dogs.
  • Oregano: This herb contains essential oils that can irritate a dog’s digestive tract, leading to vomiting and diarrhea.
  • Mint (certain varieties): While peppermint is generally safe, pennyroyal mint is highly toxic and can cause liver damage.
  • Rosemary (in large amounts): Though often used in dog treats, excessive rosemary can cause stomach upset or even seizures in sensitive dogs.
  • Tarragon: This herb contains compounds that can be toxic to dogs, potentially causing vomiting, diarrhea, and other symptoms.

Always double-check the herbs used in your cooking or gardening to ensure they’re dog-safe.

✅ Safer Alternatives

Thankfully, not all herbs are off-limits. In fact, some herbs can offer health benefits for your dog when given in moderation. Here are a few safe options:

  • Basil: Known for its anti-inflammatory and antioxidant properties, basil can be a healthy addition in small amounts.
  • Cilantro: This herb can aid digestion and freshen your dog’s breath.
  • Dill: A safe herb that may help soothe upset stomachs and support overall digestion.
  • Thyme: Safe in small quantities, thyme can support respiratory and digestive health.
  • Parsley (small amounts): While large quantities can be harmful, a sprinkle of curly parsley can freshen breath and provide vitamins.

Always introduce new herbs slowly and in small quantities to monitor for any adverse reactions.

💡 Final Advice

When it comes to herbs, prevention is key. Keep toxic plants and herbs out of your dog’s reach, whether in your kitchen, garden, or home. If you’re unsure whether an herb is safe, it’s always better to err on the side of caution.

If your dog has eaten a potentially toxic herb, watch for symptoms like vomiting, diarrhea, drooling, weakness, or changes in behavior. Contact your veterinarian immediately if you notice any of these signs.

Remember, even safe herbs should be given in moderation. Too much of any new food or plant can upset your dog’s stomach. When in doubt, consult a veterinarian for personalized advice.

FAQs

Q: What should I do if my dog eats a toxic herb?
A: Contact your veterinarian or an emergency pet poison hotline immediately. Provide details about what your dog ate, how much, and when.

Q: Can I use herbal supplements for my dog?
A: Some herbal supplements may benefit dogs, but always consult your veterinarian before introducing new supplements to ensure they’re safe and appropriate for your pet.

Book a $49 online vet consultation at https://www.dialavet.com for fast, expert advice.

References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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