“The big three mass marketers of pet food – Nestlé Purina, Mars, and Big Heart Pet Brands (recently acquired by J.M. Smucker) – are all investing heavily in the natural segment via brand reformulations, new product introductions, and acquisitions.” per Dr. Becker's article.
The term “natural segment” above refers to the brands of pet foods that I recommend – yes, they are being bought out by the large corporations above. The article went on to describe comments about Nestle Purina's buy out of Merrick and Zuke's.