Chocolate - NO!
Chocolate contains theobromine and caffeine, two stimulants that dogs cannot efficiently metabolize
If your dog eats chocolate, he may exhibit symptoms like vomiting, diarrhea and dehydration. These symptoms may lead to more serious complications, such as internal bleeding, muscle tremors, seizures and death.
Darker and less sweet varieties of chocolate, such as cocoa powder and unsweetened baker’s chocolate, are more poisonous to dogs than sweetened varieties, such as milk chocolate.
Nevertheless, do not feed your dog any type of chocolate!
Text Source: https://www.healthline.com/nutrition/human-foods-for-dogs#section9