What makes it harmful
theobromine and caffeine (methylxanthines). The two are additive, so total methylxanthine matters.
How much is dangerous
By Merck Veterinary Manual thresholds: mild signs (vomiting, diarrhea) at ~20 mg/kg; cardiotoxic effects at 40–50 mg/kg; seizures at ~60 mg/kg; lethal dose (LD₅₀) 100–200 mg/kg. Dark/baking chocolate is ~5–10× more concentrated than milk chocolate, so a small square of baker’s chocolate can already be dangerous.
Symptoms to watch for
Mild / early
- • Vomiting
- • Diarrhea
- • Restlessness
- • Increased thirst
Severe — vet urgently
- • Racing heart
- • Tremors
- • Seizures
- • Heart failure
- • Death
What to do if eaten
Call a vet or poison control immediately. Note the type and amount of chocolate and when it was eaten — this sets the risk. Do not induce vomiting unless a vet tells you to.
Frequently asked questions
- Can dogs eat chocolate?
- Toxic — can be fatal, especially dark and baking chocolate. By Merck Veterinary Manual thresholds: mild signs (vomiting, diarrhea) at ~20 mg/kg; cardiotoxic effects at 40–50 mg/kg; seizures at ~60 mg/kg; lethal dose (LD₅₀) 100–200 mg/kg. Dark/baking chocolate is ~5–10× more concentrated than milk chocolate, so a small square of baker’s chocolate can already be dangerous.
- What happens if a dog eats chocolate?
- Symptoms can include vomiting, diarrhea, restlessness, increased thirst, racing heart, and more. Severity depends on the amount and your dog’s size.
- What should I do if my dog ate chocolate?
- Call a vet or poison control immediately. Note the type and amount of chocolate and when it was eaten — this sets the risk. Do not induce vomiting unless a vet tells you to.
Sources: Merck Veterinary Manual · Pet Poison Helpline · Project book library (cross-checked).
⚠️ For general guidance, not veterinary advice. Toxicity depends on your dog’s size, the amount eaten, and individual sensitivity. Always confirm with your vet for health decisions.