I'm a newbie and have been researching foods alot. I looked at purina one compared to PPP and I notice purina one had a soy product in it which kind of turned me off. I'm going to do more research into the soy thing but it seems to be connected with alot of issues in both Humans and Dogs. But like I said I'm just a newbie. I have been having a problem with my new pup getting shaky legs and a slight bow and after help from others on this forum I switched him to a low fat diet for a couple weeks so hopefully that helps. When we get back on track I am thinking I will go with PPP sport active the 26/16 if the high fat is what was giving my pup the issue.