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					Originally Posted by Pettysmith  I don't believe what little he licked out of the cups will hurt him.  Chocolate can be toxic but even for a little dog it takes a large amount and usually has to be pure to be toxic.  Just keep an eye on him and watch for tummy upset which you probably won't see.  I have always let mine lick the cups no matter what the flavor was.  Anyway, if you are on Weight Watchers, and you are like I was, there couldn't have been much left.   | 
 
  Thanks, I am on WW so you are correct, not a lot left in mine for sure 
 
  
I did find this online and feel a bit better plus w/your post, still scares me the lil booger! 
We've all heard it, "Don't give your dog chocolate it will kill him". We'll how true is it you're probably wondering. Do I have to rush him to an emergency vet if he ate one of my M&M's? 
The truth is chocolate contains theobromine that is toxic to dogs in sufficient quantities. This is a xanthine compound in the same family of caffeine, and theophylline. 
Toxic Levels 
The good news is that it takes, on average, a fairly large amount of theobromine 100-150 mg/kg to cause a toxic reaction. Although there are variables to consider like the individual sensitivity, animal size and chocolate concentration. 
On average,
Milk chocolate contains 44 mg of theobromine per oz.
Semisweet chocolate contains 150mg/oz.
Baker's chocolate 390mg/oz. 
Using a dose of 100 mg/kg as the toxic dose it comes out roughly as:
1 ounce per 1 pound of body weight for Milk chocolate
1 ounce per 3 pounds of body weight for Semisweet chocolate
1 ounce per 9 pounds of body weight for Baker's chocolate. 
So, for example, 2 oz. of Baker's chocolate can cause great risk to an 15 lb. dog. Yet, 2 oz. of Milk chocolate usually will only cause digestive problems.  
Clinical Signs 
Xanthines affect the nervous system, cardiovascular system and peripheral nerves. It has a diuretic effect as well. Clinical signs:  
Hyper excitability 
Hyper irritability 
Increased heart rate 
Restlessness 
Increased urination 
Muscle tremors 
Vomiting 
Diarrhea 
Treatment 
There is no specific antidote for this poisoning. And the half life of the toxin is 17.5 hours in dogs. Induce vomiting in the first 1-2 hours if the quantity is unknown. Administering activated charcoal may inhibit absorption of the toxin. An anticonvulsant might be indicated if neurological signs are present and needs to be controlled. Oxygen therapy, intravenous medications, and fluids might be needed to protect the heart. 
Milk chocolate will often cause diarrhea 12-24 hours after ingestion. This should be treated symptomatically (fluids, etc..) to prevent dehydration. 
If you suspect your pet has ingested chocolate contact your Vet immediately! They can help you determine the the proper treatment for your pet.