No. Caffeine in coffee, grounds, tea bags, energy drinks and caffeine pills overstimulates a dog's heart and nervous system. A lick of coffee is unlikely to matter; grounds, beans and pills can be dangerous.

Can Dogs Eat Coffee? No

If your dog ate coffee

Call your vet or a poison line if your dog ate grounds, beans, tea bags or pills.

Call your vet or a 24/7 animal poison line now: ASPCA Animal Poison Control (888) 426-4435 · Pet Poison Helpline (855) 764-7661

What makes it harmful: Caffeine (a methylxanthine, like the theobromine in chocolate)
Signs appear: Within 1–2 hours

Symptoms to watch for

Restlessness
Panting
Vomiting
Racing heart
Tremors
Seizures

Why

Concentrated sources are the worry: used and unused coffee grounds, whole beans, tea bags, energy drinks and caffeine tablets.

Sources

ASPCA — People Foods to Avoid Feeding Your Pets

General information checked against published veterinary sources. Every dog is different — ask your vet before changing its diet, and call them if it seems unwell.