Wellness vs. Avoderm?

I've been feeding my dog Wellness and he's been doing well. I went to the local feed store today and two pet stores, Petco and Pet supplies plus and the price was $11.98 about 2 or 3 months ago for the 5 lb bag. Now it's $15.99!!!!!! Is that all over the country or just my area? So, anyway, I saw Avoderm and it was only $7.49 for the 4.4 lb bag and I got it and my dog loves it. My neighbor saw the bag and told me that it's not good for dogs cause it has avocados in it and that they are poisonous to dogs. I've looked it up and am getting ALOT of conflicting information. What does everyone on here think of these two questions about the Wellness price and the Avoderm being toxic to dogs? Any good info is welcome. Thanks.