Dogs shouldn't eat include grapes, raisins, yeast dough and foods containing alcohol, as well as garlic, onions and chives, explains the American Society for the Prevention of Cruelty to Animals. Alcoholic drinks and alcohol-containing foods can cause decreased coordination, diarrhea, vomiting, tremors and even death. Yeast dough rises in canine digestive systems and causes painful gas and bloating. Grapes and raisins can cause kidney failure in dogs, although researchers have not identified the toxic substance in the fruits.

People should not feed their dogs coffee, chocolate or caffeine, all of which contain methylxanthines, substances that occur naturally in cacao seeds, explains the ASPCA. Methylxanthines can cause abnormal heart rhythms, excessive urination and thirst, hyperactivity, and death. Garlic, onions and chives irritate the gastrointestinal system and can lead to damage of red blood cells in dogs if the amount the dogs eat is large enough.

Eating yeast dough can cause twisting in canine stomachs, creating a life-threatening situation, notes the ASPCA. Ethanol is a yeast by-product, and eating raw bread dough containing yeast can make dogs drunk, just like alcoholic beverages. Symptoms of alcohol consumption include depressed activity of the central nervous system, abnormal blood acidity, breathing problems and coma. People who suspect their dogs have consumed alcoholic beverages or foods should contact their veterinarians or the ASPCA animal poison control center as soon as possible.