The toxicity of chocolate depends on the amount and type of chocolate ingested:
Potential Toxic Dose (44lb dog)
3 oz Unsweetened Cocoa
5 oz Baking Chocolate
7 oz Semisweet Chocolate
20 oz Milk Chocolate
Make sure pets are given some "personal space" if they want to get away from the commotion. If necessary kennel the dog if your house is going to be hectic for a gathering. Make sure that you are getting out and still exercising with your pooch to get out that extra energy.