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First thing is to not panic. Different kinds of chocolates have different toxicity amounts. Chocolate contains theobromine, which is what causes the toxic response. If the dog ate the chocolate recently (within last 2 hours), you can induce vomiting with 1 teaspoon of hydrogen peroxide 3% per 10 pounds, which can be repeated 10 minutes later if it does not induce vomiting. If he dog doesn't vomit, you can gently slosh the stomach a little to get the dog to vomit. Items such as cookies and cakes will have less actual chocolate in them, so you will have to make an estimate in the amount of chocolate that may have been in the amount of brownie your dog may have ingested .

Signs of theobromine toxic poisoning should appear within 1 to 4 hours of ingesting the chocolate. These include vomiting, increased thirst, diarrhea, weakness, difficulty keeping balance, hyperexcitability, muscle spasm, seizures, coma and potentially death from an abnormal heart rhythm.

The following websites will give you’re the approximate amounts of chocolate that you will need to worry about based on the size of your dog and the type of chocolate. Consult this page to determine if a toxic amount has been ingested.

http://www.vspn.org/Library/misc/VSPN_M01325.htm

http://www.beaglesunlimited.com/beaglehealth_chocolatetoxicosis.htm

http://www.thedachshundnetwork.com/foodtox.htm

http://www.michvet.com/library/emergency_chocolate_toxicity.asp

If your dog has ingested enough to be toxic according to the chart, you need to have your dog taken to the vet for supportive care. Your vet can administer charcoal to absorb the toxins and let it pass through your dog’s system with less absorption and monitor your dog’s vital signs until the danger has passed.

You also should be aware of the fact that the high fat content in chocolate can also trigger pancreatitis in some dogs and you may wish to take your dog into the vet to avoid this condition developing and definitely keep an eye out for symptoms of this.. You can read about pancreatitis here:

http://www.peteducation.com/article.cfm?c=2+1580&aid=335

http://www.petplace.com/dogs/acute-pancreatitis-in-dogs/page1.aspx

If this was a cake type brownie, you may not see much of a reaction beyond a little diarrhea. If it was one that was very rich with chocolate you will need to estimate the amount of actual chocolate in the brownie, but it is still not likely to be a toxic amount but I'd go ahead and induce vomiting to get as much back out.

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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.

http://www.fda.gov/AnimalVeterinary/SafetyHealth/RecallsWithdrawals/

Jason,

It depends on how much she weighs though it might be twice as much as needed. Slosh the belly gently to trigger the vomiting so all of it comes back up anyway. If it doesn't, try feeding a little bread and repeating the sloshing. It should trigger vomiting within 15 minutes or so.