While your dog's food may say "Made in the US" on its packaging, it doesn't mean any or all of the ingredients came from the US. In fact, many dog food companies source various ingredients from China, and they are not required to disclose it to us as consumers.
Problems with ingredients sourced from China include a history of contamination issues (melamine), lax environmental standards (air pollution that can impact vegetables dried in the sun) and poor quality-control standards (safety). So why do dog food companies continue to source their ingredients (like potatoes and synthetic vitamins) from China? Cost. China is the lowest cost, and in the case of synthetic vitamins, the ONLY producer of all of these ingredients.
WHY THIS MATTERS:
It is difficult (and more expensive) to find ingredients that aren’t sourced from China. A dog food company that guarantees no China-sourced ingredients (like COAST+RANGE) shows that they go the extra step to ensure the quality and safety of their products.