Pam
11-30-2000, 06:59 PM
I received this in an e-mail tonight and wanted to share it with our Forum. I always knew that chocolate was bad for our friends, but now it seems that onions are too.
Onions are the most common cause in the dog of a particular type of red blood destruction (Haemolysis) that can result in anemia and collapse. This poisonous effect in dogs (and cats) has been recognized for over 50 years and appears to be equally great, whether the onion is raw, cooked - even in onion soup - or dehydrated.
A small amount of onion as a flavoring is not likely to cause any problems, but some dogs become addicted to the taste. Following consumption of a significant amount of onion, there occurs, within 24 hours, a change in the red pigment (Hemoglobin) in the red blood cells which are responsible for carrying oxygen. Some of the pigment collects into tiny round or oval structures named Heinz bodies at the surface of the red blood cells. Their presence reduces the flexibility of the cell membrane and affected red blood cells may rupture and/or be removed by the white blood cells.
The loss of a large number of red blood cells in this manner can result in anemia four or five days after eating the onions. Also some blood pigment, liberated from the damaged cells, may appear in the urine, giving it a pink color. Because of the lengthy time interval before these clinical signs appear, they may not be correlated with the previous ingestion of onions. The condition is reversible and recovery will occur, provided the anemia is not too severe, and this presupposes that the consumption of appreciable amounts of onion does not continue.
Onions are the most common cause in the dog of a particular type of red blood destruction (Haemolysis) that can result in anemia and collapse. This poisonous effect in dogs (and cats) has been recognized for over 50 years and appears to be equally great, whether the onion is raw, cooked - even in onion soup - or dehydrated.
A small amount of onion as a flavoring is not likely to cause any problems, but some dogs become addicted to the taste. Following consumption of a significant amount of onion, there occurs, within 24 hours, a change in the red pigment (Hemoglobin) in the red blood cells which are responsible for carrying oxygen. Some of the pigment collects into tiny round or oval structures named Heinz bodies at the surface of the red blood cells. Their presence reduces the flexibility of the cell membrane and affected red blood cells may rupture and/or be removed by the white blood cells.
The loss of a large number of red blood cells in this manner can result in anemia four or five days after eating the onions. Also some blood pigment, liberated from the damaged cells, may appear in the urine, giving it a pink color. Because of the lengthy time interval before these clinical signs appear, they may not be correlated with the previous ingestion of onions. The condition is reversible and recovery will occur, provided the anemia is not too severe, and this presupposes that the consumption of appreciable amounts of onion does not continue.