A homemade chocolate chip cookie made from the original Toll House recipe holds about 5.7 g of semisweet chips (a 12 oz bag of chips makes about 5 dozen cookies). Using this site's factor of about 150 mg of methylxanthines per ounce of semisweet chocolate, that is roughly 30 mg per cookie. Merck reports mild signs from about 20 mg/kg, heart effects at 40–50 mg/kg and seizures at 60 mg/kg or more. A 10 lb dog can pass 20 mg/kg after about 3 cookies. Bakery cookies are often bigger and carry more chocolate, so change the chips-per-cookie figure in the calculator. Call your vet, ASPCA (888) 426-4435 or Pet Poison Helpline (855) 764-7661.
Published dose reference: Merck Veterinary Manual — chocolate and methylxanthines; Original Nestlé Toll House chocolate chip cookie recipe.
How we estimate chocolate per cookie
This is an assumption, not a measurement of your cookie. The original Toll House recipe uses a 12 oz (340 g) bag of semisweet morsels for about 5 dozen cookies, which works out to about 5.7 g of chips per cookie. The methylxanthine (theobromine plus caffeine) figures come from the site's chocolate calculator: semisweet or dark chips about 150 mg/oz and milk chocolate chips about 58 mg/oz. White chocolate contains almost none. Large bakery cookies, double-chocolate cookies and cookies with chocolate chunks can contain several times more, so enter your own grams per cookie if you know them.
Dose table by dog weight and number of cookies
Estimated methylxanthine dose for semisweet chip cookies at 5.7 g of chips per cookie. Merck's guideposts are about 20 mg/kg for mild signs, 40–50 mg/kg for heart effects and 60 mg/kg or more for seizures.
Published dose reference: Merck Veterinary Manual — chocolate and methylxanthines; Original Nestlé Toll House chocolate chip cookie recipe.
| Dog weight | 1 cookie | 3 cookies | 6 cookies | 12 cookies | Cookies to ~20 mg/kg | Cookies to ~60 mg/kg |
|---|---|---|---|---|---|---|
| 5 lb / 2.3 kg | 13 mg/kg | 40 mg/kg | 80 mg/kg | 160 mg/kg | 1.5 | 4.5 |
| 10 lb / 4.5 kg | 6.6 mg/kg | 20 mg/kg | 40 mg/kg | 80 mg/kg | 3 | 9 |
| 20 lb / 9.1 kg | 3.3 mg/kg | 10 mg/kg | 20 mg/kg | 40 mg/kg | 6 | 18 |
| 40 lb / 18 kg | 1.7 mg/kg | 5 mg/kg | 10 mg/kg | 20 mg/kg | 12 | 36 |
| 80 lb / 36 kg | 0.8 mg/kg | 2.5 mg/kg | 5 mg/kg | 10 mg/kg | 24 | 72 |
Published dose reference: Merck Veterinary Manual — chocolate and methylxanthines; Original Nestlé Toll House chocolate chip cookie recipe.
These numbers are approximate and are not safe limits. A dog that ate fewer cookies than the table shows can still get sick, and the cookie's other ingredients may matter more than the chocolate.
Other cookie ingredients that can be worse
- Raisins (oatmeal-raisin or "trail mix" cookies): there is no proven safe amount for dogs. See raisins.
- Macadamia nuts (white chocolate macadamia cookies): can cause weakness, tremors and fever. See macadamia nuts.
- Xylitol (sugar-free or "keto" cookies): can cause dangerously low blood sugar. Check the label for xylitol or birch sugar. See xylitol.
- Fat and sugar: Merck notes that the high fat content of chocolate products may trigger pancreatitis in susceptible dogs, even when the methylxanthine dose is low.
Symptom timeline
- Within 6–12 hours: Merck reports that chocolate signs usually start in this window. Early signs include vomiting, diarrhea, thirst, restlessness and panting.
- Higher doses: a racing heart, tremors and seizures (Merck: heart effects at 40–50 mg/kg, seizures at 60 mg/kg or more).
- Days later: vomiting, belly pain and not eating can point to pancreatitis from the fat in the cookies.
Published dose reference: Merck Veterinary Manual — chocolate and methylxanthines; Original Nestlé Toll House chocolate chip cookie recipe.
What to do now
Dog poison control: phone numbers, fees and when to call.
- Count the missing cookies and keep the packaging or recipe.
- Check for raisins, macadamia nuts or a sugar-free sweetener in the ingredients.
- Use the calculator on this page with your dog's weight and the number of cookies.
- Call your vet or a poison hotline for advice, especially if the estimate is 20 mg/kg or more or any other risky ingredient is present. Do not make your dog vomit unless a vet tells you to.
Published dose reference: Merck Veterinary Manual — chocolate and methylxanthines; Original Nestlé Toll House chocolate chip cookie recipe.
Related pages
- Chocolate toxicity calculator — for bars, baking chocolate and cocoa
- Dog ate chocolate — full chocolate guide
- Dog ate raisins
- Dog ate macadamia nuts
- Dog ate xylitol
When to call for help
Call your veterinarian promptly after a known or suspected ingestion. ASPCA Animal Poison Control Center is available at (888) 426-4435 and Pet Poison Helpline at (855) 764-7661. These poison-control lines may charge a consultation fee. If your dog collapses, has a seizure, struggles to breathe, cannot stand or has a swollen painful abdomen, seek emergency veterinary care immediately; do not delay transport to finish reading or calculating a dose.
Have the dog's weight, the product or plant name, the maximum possible amount and the ingestion time ready. Bring the packaging or a clear photograph. The information lookup linked on this page can organize details, but it does not replace a poison-control consultation or urgent treatment. Do not induce vomiting without veterinary advice. This reference summarizes published veterinary sources; it does not establish a diagnosis or claim a new veterinary review.