We all know chocolate is poisonous to dogs, but not all chocolate is equal.  What is toxic to the dog is the theobromine in the chocolate and different chocolates contain different levels of theobromine;  white chocolate has the least about of theobromine with1 mg per ounce; Baker's chocoate has the most with 450 mgs per ounce!  Obviously, Baker's chocolate (or baking chocolate) is the most harmful, but enough milk chocolate can be harmful too.  Here are some guideline regarding toxicity:

• White chocolate: 200 ounces per pound of body weight.  It takes 250 pounds of white chocolate to cause signs of poisoning in a 20-pound dog, 125 pounds for a10-pound dog.
• Milk chocolate: 1 ounce per pound of body weight. Approximately one pound of milk chocolate is poisonous to a 20-pound dog; one-half pound for a 10-pound dog. The average chocolate bar contains 2 to 3 ounces of milk chocolate. It would take 2-3 candy bars to poison a 10 pound dog. Semi-sweet chocolate has a similar toxic level.
• Sweet cocoa: 0.3 ounces per pound of body weight. One-third of a pound of sweet cocoa is toxic to a 20-pound dog; 1/6 pound for a 10-pound dog.
• Baking chocolate: 0.1 ounce per pound body weight . Two one-ounce squares of bakers' chocolate is toxic to a 20-pound dog; one ounce for a 10-pound dog.

What to do if you see your dog has eaten chocolate:

Induce vomiting in the first 1 to 2 hours if amount ingested is unknown or if a toxic level has been ingested.

Consult your vet -- follow up charcoal treatment may be required.

Symptoms of Chocolate Dog Ingestion and Poisoning

You can recognize that your dog has eaten a toxic dose of chocolate from the symptoms. Within the first few hours, the evidence includes vomiting, diarrhea or hyperactivity. As time passes and there's increased absorption of the toxic substance, you'll see an increase in the dog's heart rate, which can cause arrhythmia, restlessness, hyperactivity, muscle twitching, increased urination or excessive panting.

This can lead to hyperthermia, muscle tremors, seizures, coma and even death.

SEE YOUR VET ASAP

Thanks for the great information.

When my Lacey was about 10 weeks old she got in to the kids easter candy (lots of chocolate) and ate all of it.  She got very sick.  She couldn't even walk straight, like she was drunk.  I took her straight to the vet and walked in with her sobbing thinking she was going to die.  They kept her over night, and she recovered.  Believe it or not though, she still loves chocolate and I have to keep the kids chocolate from holidays way up high!!

Thank you so much for the information!