Hello. It would be almost impossible to say how much onion extract is actually present in the broth. That being said, since it is the last ingredient & the broth ( which I use ) does not have a strong onion smell or taste, it is probably a very small amount. I would, however, not recommend giving this to your pet on a daily basis. Once in a while is fine, but a little onion extract daily MIGHT cause a problem. If you want to supplement Shawn's diet with broth every day, then go the homemade route & leave out any onions. Then you will also have some delicious chicken for treats or salad left over for you. Thanks for using Petco Pet Education Center, formerly Petcoach.