who also don't know who to believe,
Everyone and their mothers can write books on what they believe or what they practice. You can, I can.
It's not about believing. It's about understanding the nature of who and what a dog or cat is, what their origins are, and what their purpose is.
With a "natural diet", always look towards Mother Nature, then you rarely, if ever, have problems. In a natural world kibble would not exist, yet dogs surely would, so would cats and a host of other animals we sequester for our own personal needs.
I keep telling people this. It's not a rocket science. We have to STOP thinking like humans and START think like a dog. IF you do this all of your feeding problems will be over. Always, always, always follow Mother Nature's plan.