Over feeding anything is bad. The fruit of the avocado has been proven safe for dogs.
My sister-in-law has been feeding it for 15 years, no problems. We also feed raw chicken. Lots of mis-information on that too.
The food does not use the fruit of the avocado just an FYI, they use the OIL. I'm not saying it's a bad food, I'm just saying to watch for signs just in case, I'm sure all dog's tolerances are different and since nobody really knows how much a dog can have before it's toxic to just be catious with it.
There isn't any misinformation on raw chicken for people that have looked into raw diets. I think there's the scare of chicken bones in general and people assume that means all chicken bones not realizing it means cooked bones but that all cooked bones carry the same scare (breaking and splintering) it's just easier for chicken bones because they're smaller.
I did A LOT of research on the avocado deal because I was considering and even purchased a bag of it to feed it to my dogs. Personally in the end I didn't think the risk was worth it and I decided against it. But I researched it for weeks before making my decision, made my decision although I didn't have a good feeling about it, and then decided with so many good foods on the market in the same price range it just wasn't worth it to me to gamble with it and take the chance. So, I'm not just spouting half known knowledge. And again not saying it's a bad food, ingredient wise it's good, it's reasonable price wise, easy to find in larger chain pet stores, their record is pretty clean with regards to customer complaints, etc, all I am saying is watch for the signs of toxicity just in case.