Short answer: Safe and potentially beneficial in moderation: parsley (breath), basil (antioxidant), oregano (antifungal), rosemary (antioxidant), thyme (digestive), ginger (nausea), turmeric (joint), milk thistle (liver support). Avoid: chives, garlic, onion (all Allium species), and anything in large quantities.
What you should actually do
- Avoid: garlic, onion, chives, leeks – all Allium – cause hemolytic anemia.
- Use small amounts (1/4 tsp per 10 lb body weight max) as garnish, not main ingredients.
- Ginger: 0.25-1 mg/lb is anti-nausea; useful for motion sickness.
- Milk thistle (silybum): liver protective; common veterinary supplement (Denamarin combines silybin + SAMe).
- Avoid concentrated essential oils internally – many are toxic; some (tea tree, citrus) are toxic even topically.
Whole, fresh herbs in small amounts are generally safe for dogs and can add modest nutritional or functional benefit. Concentrated extracts and essential oils are a different story – many are toxic at small doses.
Discuss any new supplement or herb with your vet before adding regularly, especially if your dog is on medications – herbs can interact with anticoagulants, NSAIDs, anticonvulsants, and more.
Dig deeper
⚕️ Medical Disclaimer
The information on this page is intended for educational purposes only and does not replace a hands-on veterinary examination. Drug doses depend on your dog’s complete clinical picture, concurrent medications, and the exact product formulation. Always confirm dosing with your veterinarian before administering any medication, and contact a 24-hour veterinary emergency service or animal poison control immediately if you suspect a medication overdose or adverse reaction. Editorial standards: every drug dose published on PuppaDogs is cross-checked against multiple authoritative veterinary references and reviewed by PuppaDogs Veterinary Editorial Team before publication.
