Pet safety · Cats
Toxic Herbs for Cats — Safety Checker
Cats lack glucuronidation — they cannot detoxify many compounds that are safe in dogs or humans. Essential oils, many Apiaceae herbs, and Allium are absolute contraindications. This list is tighter than dogs by design.
Do not give to cats
- • ALL essential oils topically or internally (tea tree, peppermint, pine, citrus, eucalyptus — can be fatal)
- • Garlic and onion family (any amount, chronic = fatal)
- • Lilies (not herb but commonly confused with herbs)
- • Pennyroyal
- • Comfrey (PAs more dangerous in cats)
- • Acetaminophen (common in tinctures — fatal)
- • St John's Wort (photosensitivity severe in cats)
Commonly safe with care
- • Catnip (Nepeta cataria)
- • Valerian (inhalation, not high dose)
- • Chamomile (very dilute tea)
- • Slippery elm (for GI)
- • Milk thistle (liver support)
- • Dandelion leaf
Always consult a holistic vet; weight and condition-specific dosing required.
Species notes
- Cats self-dose via inhalation and grooming — low-dose hydrosols are preferable to tinctures.
- Any herb that affects liver CYP enzymes is more concerning in cats because they rely heavily on oxidative metabolism.
- Always dilute tinctures with water; the alcohol alone can be a concern for small cats.