chocolate can be poisonous to dogs, but that depends on the amount and type of chocolate your dog has ingested and your dog's body weight.
here's a good read taken from:
http://www.brighthub.com/pets/dogs/articles/36471.aspx
Chocolate is potentially poisonous to dogs and can even cause death in some cases. While some chocolate is more toxic to pets than others, it is considered a good idea to not give your dog even a taste of the sweet treat. Carob is considered a tasty and safe alternative.
How Chocolate Can Hurt Dogs
Chocolate has two ingredients that do not agree well with dogs - caffeine and theobromine. While caffeine in any form is not ideal for any dog's diet, theobromine is the substance that can kill a pet in certain amounts. It can take a canine up to 20 hours to metabolize theobromine after eating chocolate. As the ingredient remains in the dog's bloodstream, it harms the heart and kidneys and revs up the central nervous system. Some dogs have become extremely aggressive after eating chocolate, which poses a number of concerns of its own.
Fatal Doses
A fatal dose of chocolate depends largely on the dog's body weight, type of chocolate eaten, and the amount consumed. However, even small doses of chocolate can cause a number of health problems in your canine friend.
Consuming 100 to 200 mg of theobromine or caffeine per pound of body weight is considered lethal. However, seizures (which can be life-threatening events in themselves) can occur when your pet eats 60 mg of either substance per pound of body weight. Other severe symptoms of poisoning can happen at 40 to 50 mg per pound of body weight, and mild ailments can begin at just 20 mg per pound of body weight.
It is also important to remember that even a taste of chocolate can cause vomiting and disturbances in your dog's bowel movements, due to the high fat and sugar content.
Symptoms
Within 4 to 24 hours of your dog eating chocolate, a number of symptoms may begin to show. Excessive thirst, vomiting, diarrhea, increased urination, and restlessness are usually among the first symptoms that indicate your dog may have gotten into some chocolate. As more theobromine is absorbed into your pet's bloodstream, the poisoning symptoms can grow more severe. As the symptoms advance, they may include coordination problems, hyperactivity, muscle twitching, increased heart rate, and elevated blood pressure. Severe cases of chocolate consumption can lead to seizures, coma, heart problems, and even death.
Chocolate Toxicity Levels
All chocolate should be avoided, but there are some types far more hazardous than others. Information about the average levels of theobromine and caffeine in chocolate products is as follows:
Dry cocoa powder: About 810 mg per ounce.
Unsweetened baking chocolate: About 440 mg per ounce.
Instant cocoa powder: About 150 mg per ounce.
Dark sweet chocolate: About 150 mg per ounce.
Milk chocolate: About 65 mg per ounce.
White chocolate: About 1 mg per ounce.
Small dogs, such as Yorkshire Terriers and chihuahuas, are especially prone to chocolate poisoning due to their body weight. In addition, studies show that once a dog has even a bite of chocolate as a treat that he or she is more likely to go on the hunt for more chocolate, getting into cabinets and other places where large amounts of chocolate may be hidden. This of course can become a fatal accident.
Treatment
If caught early enough, most cases of chocolate poisoning can be treated by a vet. If you gave your dog chocolate and see any symptoms indicating a problem, or believe your dog may have eaten something he should not have, call a vet immediately. Follow any instructions offered, such as inducing vomiting. In advanced cases of theobromine ingestion, your dog may need surgery to make a full recovery. Most dogs will recover within 1 to 3 days of being treated, but this depends on how quickly help is sought, what was consumed, the size of the canine, and the pet's general health status before ingesting chocolate.
Originally Posted by rom69erz
mahalon gud ug chocolate ipakaon ni justice H... i wish i could be ur dog
tambok man gani kaayo ang isa...
n.inana imo dog?? 
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