Nestlé attempts to buy pet care company Ralston Purina has been hit by anti-trust concerns. The US Federal Trade Commission (FTC) has sought more information on the US$10bn deal after a rival pet food maker voiced concerns to the FTC about the size and power of a combined Nestlé and Ralston Purina company. The Nestlé-Purina combination would control nearly 70% of the dry cat food market.