Chocolate poisoning in dogs: treatment
12 kg Beagle that ate a 200 g bar of 70% dark chocolate an hour ago at Christmas. For now it is only slightly restless.
Besides inducing emesis, which measure is correct?
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A. Discharge if there are no clinical signs at 2 hours
Signs may take 6–12 hours to appear and last up to 72 hours, because theobromine has a long half-life in dogs. With a high dose, the dog must be monitored.
B. Repeated doses of activated charcoal, fluid therapy and encouraging frequent urination (or urinary catheterisation), because methylxanthines are reabsorbed from the bladder
Correct. Theobromine undergoes enterohepatic recirculation and is reabsorbed from bladder urine. Emptying the bladder often and repeated charcoal shorten exposure.
C. Atropine to control tachycardia if it develops
Atropine increases heart rate. Severe supraventricular tachycardia is controlled with a beta-blocker (esmolol, propranolol) and ventricular arrhythmias with lidocaine.
D. None: dark chocolate is the lowest-risk type because it contains less sugar
The risk depends on the methylxanthine content, not the sugar: cocoa powder and dark chocolate are the most dangerous; white chocolate contains hardly any theobromine.
lightbulb Key takeaway
Calculate the methylxanthine dose from the type of chocolate and body weight: mild signs appear from about 20 mg/kg, cardiac signs around 40–50 mg/kg and seizures above 60 mg/kg. Chocolate can form a mass in the stomach, so emesis can be useful even several hours later. Typical signs are vomiting, polyuria, restlessness, tachycardia, tremors and hyperthermia.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.