Bests & Worsts Reviews from Amazon

My dogs liked these and I just lost both of them to hemangiosarcoma within 2 weeks of each other, aged 8 and 9. Do not know if I can pin that on these but reading about the ingredients and trouble they have caused others, I am suspicious. They say "made in USA" but where is their meat sourced? China? Also the product contains onion extract which is toxic to dogs, I just tossed an unopened bag in the trash. Out of caution look elsewhere for SOURCED and made with USA duck,chicken etc