According to Can I Give My Dog, bread is fine for dogs to consume as long as it is in small quantities. Bread does not provide much nutritional value to dogs, and consuming too much can cause weight gain.
According to Pet Poison Helpline, dogs should never consume unbaked bread dough. When dogs consume unbaked bread dough, the yeast causes the dough to rise in the stomach and results in stomach bloat. In certain cases, stomach bloat can cause serious issues such as a twisted stomach in dogs. The yeast in unbaked bread dough can also ferment and cause alcohol poisoning.