What are the potential risks of feeding dogs onions, and how can onion consumption lead to death in dogs?

Feeding dogs onions can be harmful because onions contain compounds that can damage a dog's red blood cells, leading to a condition called hemolytic anemia. This can cause symptoms like weakness, vomiting, and difficulty breathing. In severe cases, onion consumption can lead to death due to the destruction of red blood cells and the inability of the body to transport oxygen effectively. It is important to avoid feeding dogs onions to prevent these serious health risks.