Coffee

Short and clear: Coffee has no place in the bowl – or indeed anywhere within reach – of a dog. The reason is caffeine, which is a real poison for dogs. Even relatively small amounts can make the heart race, trigger seizures and, in the worst case, prove fatal. Dogs break down caffeine significantly more slowly than we humans do – what is a morning routine for us becomes an emergency for them.

Why do dogs react so strongly to coffee?

Caffeine is the key active ingredient in coffee – and it is precisely this that causes dogs so much trouble. It simultaneously stimulates the central nervous system and the cardiovascular system, which has an invigorating effect in humans. In dogs, however, the same system quickly leads to dangerous overstimulation.

• Caffeine is broken down very slowly in dogs: The metabolism of dogs processes caffeine far more slowly than the human one. Even small sips are enough to trigger signs of poisoning.
• The heart and nerves come under stress: Caffeine drives up the heart rate and overstimulates the nervous system – rapid heartbeat, trembling and seizures can be the result.
• Caffeine accumulates: Because breakdown is so slow, the substance builds up in the dog’s body and can cause serious damage.

What specific health risks are involved?

Caffeine poisoning

Coffee is rapidly absorbed into the bloodstream via the intestines and then affects the nervous system and heart – both react immediately. Poisoning can set in even with small amounts; the signs are manifold:

• Restlessness and hyperactivity
• Trembling or muscle twitching
• Vomiting and diarrhoea
• Rapid or irregular breathing
• Rapid heartbeat or palpitations
• Increased thirst and frequent urination
• Fever
• Weakness or collapse
• Seizures

Especially in small dogs, the time span until a life-threatening situation is frighteningly short – their body weight leaves little room for manoeuvre.

Heart problems and breathing difficulties

Caffeine has a strong stimulating effect on the cardiovascular system. An accelerated heartbeat or arrhythmias are not uncommon – and both can impair breathing so severely that it becomes life-threatening.

Gastrointestinal problems

Coffee irritates the gastrointestinal tract considerably. Vomiting and diarrhoea are common initial signs; the resulting dehydration worsens the dog’s condition additionally and quickly.

From what amount does coffee become dangerous for dogs?

The threshold is alarmingly low. A lethal dose is considered to be approximately 70–100 mg of caffeine per kilogram of body weight – yet noticeable symptoms of poisoning can occur well below that level. A few comparative values help put this into perspective:

• A cup of brewed coffee (240 ml) contains around 95 mg of caffeine.
• An espresso (30 ml) comes in at about 60–80 mg of caffeine.
• Coffee beans or ground coffee contain approximately 10 mg of caffeine per gram.

For a Chihuahua or a Pomeranian, even a few nibbled coffee beans, an espresso spilled on the floor, or forgotten coffee grounds in the bin can become a serious problem.

What to do if your dog has ingested coffee?

If your dog has drunk coffee or eaten coffee beans – no matter how little – the rule is: act immediately, do not wait.

1. Go straight to the vet: Caffeine poisoning is a medical emergency. Do not wait for symptoms to appear – the toxic effect sets in quickly, and every minute counts.
2. Keep an eye on symptoms: Trembling, restlessness, rapid breathing, vomiting, seizures – all of this can intensify within a short time. Describe to the vet exactly what and how much your dog has ingested.
3. Do not use home remedies: Please do not attempt to induce vomiting yourself or intervene in any other way. Treatment for caffeine poisoning usually involves intravenous fluids and medication – this is not something for home care.

Not just coffee: These caffeine-containing products are also off-limits

Coffee is the most well-known example, but by no means the only problem. Many everyday products contain caffeine in significant amounts:

• Tea (black tea, green tea, yerba mate)
• Energy drinks
• Caffeine-containing soft drinks (e.g. cola)
• Caffeine powder or tablets
• Chocolate and cocoa (also contain theobromine – likewise toxic to dogs)
• Caffeine-containing medications and dietary supplements

All these products should be kept consistently out of reach – preferably in closed cupboards, not on the coffee table or on the floor.

Conclusion: Coffee is highly toxic to dogs

Caffeine and dogs do not mix – this is no exaggeration. Even small amounts can lead to serious poisoning, heart problems, and seizures. If your dog has accidentally ingested coffee, every minute counts: go straight to the vet without delay.