✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-09-27
Can dogs eat tea?
The full picture
Tea is a more nuanced toxicity than most owners realise. The active compounds are caffeine and theobromine — the same two methylxanthines that make chocolate dangerous to dogs. Standard UK black tea contains around 50mg of caffeine per cup.
Is tea bad for dogs? Yes, but severity depends entirely on how much they drink relative to their body weight. Caffeine becomes toxic to dogs at around 9mg/kg body weight. A 10kg dog drinking a full cup of strong black tea reaches the mild-toxicity threshold.
Tea bags are a separate problem. A dog who finds a tea bag in the bin and eats it gets a concentrated dose — much higher than a brewed cup.
Caffeine-free herbal teas (chamomile, rooibos, peppermint) are lower-risk but herbal blends can contain other compounds that are problematic for dogs. The safest approach: don't give dogs tea of any kind.
Roughly how much caffeine did they get?
Caffeine toxicity in dogs is dose-dependent — this turns what your dog drank into a rough mg/kg figure so you know how seriously to take it.
If your dog ate more than a safe amount
Call your vet or the Animal PoisonLine on 01202 509000 if your dog has drunk more than a few licks of tea, eaten a tea bag, or is showing restlessness, panting, a racing heart, tremors, or vomiting. Symptoms of caffeine toxicity typically develop within 1–2 hours of ingestion.
Risks to watch for
- Caffeine and theobromine toxicity
- Teabags can cause blockage if swallowed
- Herbal teas vary wildly
- Milky tea adds lactose
Safe portion size
Not recommended. A tiny lick of cooled milky tea rarely causes harm.
Safer alternatives
While you're checking what your dog can safely eat, make sure their flea and worm protection is up to date too.