I remember years ago, when I was a teen and had the best Blue Heeler the world has ever known (LOL...my opinion here obviously)...I used to read Grass Roots, for healthier lifestyle things and such, it was said that giving a dog Garlic was a healthy way of keeping fleas away...I never used it 'cause the thought of smelling that stale garlic smell on her breath was a big turn off. But yeah I did feed her left overs and that included onions (didn't know about the problems here either)...Sharah lived til she was 14. I guess it must depend on the dog...but now I know I dont want to risk it anymore.