Chloride in dog food has recently been discovered to be bad there is not yet going to be a scientific peer-reviewed article on it. Its hard to find "proof" on anything in the dog food business. There's also no peer reviewed article that says raw prey food is best for carnivores, because scientists don't waste their time writing common sense and getting it reviewed, they won't get paid for that. Beet pulp is "the dried residue extracted from the processing of manufactured sugar. It contains pure sucrose, as in common white refined sugar. The fiber content of beet pulp is used as a filler and as a bunder to artificially create better formed stools" I suppose with the sucrose removed its just used to make you think the dog has good stool, therefore healthy.