Mazy Cat
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In 2009, an Environmental Working Group (EWG) study found that 8 out of 10 major national dog food brands contained fluoride in amounts up to 2.5 times higher than the Environmental Protection Agency's (EPA) national drinking water standard.1In all eight cases, the suspected ingredients containing excess fluoride were bone meal and animal byproducts. According to the lead researcher of the EWB-sponsored study, Olga Naidenko, Ph.D.:"Due to a failed regulatory system and suspect practices by some in the pet food industry, countless dogs may be ingesting excessive fluoride that could put them at risk."The eight dog foods containing high levels of fluoride contained chicken byproduct meal, poultry byproduct meal, chicken meal, beef and bone meal.We can conclude from the study results that the primary culprits are animal byproducts and bone meal. (Not all chicken meals contain internal organs and bones — some are made exclusively from muscle meat.)