Onions -Dogs should not eat them!
Onions contain N-propyl disulfide, a compound that is toxic to dogs. It can damage your dog’s red blood cells, reducing their ability to carry oxygen through the body. This often results in a condition called anemia.
Anemia in dogs is characterized by a variety of symptoms, including lethargy, weakness, decreased appetite and fainting. In severe cases, dogs with anemia may need a blood transfusion
It is important to note that all components and forms of onions are toxic to dogs, even the leaves, juice and processed powders, such as onion powder.