Why coffee grounds are a triple threat to small dogs
Discarded grounds contain up to three times more caffeine by volume than brewed coffee—what looks like a harmless cleanup snack is actually a concentrated stimulant bomb for your 5 kg Pomeranian. The porous texture of used grounds also means they absorb stomach acid, prolonging caffeine's release into their system.
Vomiting twice suggests their body recognizes the threat but can't expel enough of the toxin. Coffee grounds often form dense clumps in the stomach that are harder to regurgitate completely than liquid coffee would be.
The dangerous math of caffeine per kilogram
A Pomeranian's tiny body weight magnifies every milligram of caffeine. Two tablespoons of wet grounds could deliver a potentially fatal dose to a dog this size. Vomiting reduces but doesn't eliminate the risk—their system may have already absorbed enough to cause systemic effects.
Watch the clock closely: if the second vomit occurred more than 30 minutes after the first, their digestive tract is likely struggling to cope rather than effectively purging. This timing suggests caffeine is now circulating in their bloodstream.
How tremors differ between dogs and cats
Dogs often show caffeine's effects more dramatically than cats—your Pom may exhibit full-body tremors rather than subtle whisker twitches. Their smaller muscle mass means neurological symptoms appear sooner and more intensely. Paw paddling or head bobbing are red flags in toy breeds.
Unlike cats, dogs may vocalize from the discomfort of caffeine poisoning. High-pitched whining or yelping when touched indicates their nervous system is in overdrive. These sounds often precede seizure activity in small dogs.
Why emergency care can't wait for business hours
Caffeine's effects on a Pomeranian's heart can last 12-24 hours—far beyond when most general practices reopen. The combination of vomiting and potential heart rhythm abnormalities creates a dehydration risk that requires IV fluids to manage safely.
Bring a photo of the grounds container if possible—different roasts and preparations vary in caffeine content. This helps the vet tailor treatment to your dog's specific exposure level rather than relying on general estimates.
The full verdict, portion guidance and serving notes are collected on the Coffee & caffeine food facts page.