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In May 2014, Purina filed a lawsuit against competitor Blue Buffalo regarding alleged false advertising. Blue Buffalo advertised that its products contain no meat byproduct or corn, whereas Purina said independent lab tests confirmed that they do. Blue Buffalo made similar allegations against Purina in a counter-suit less than a week later. It also alleged Purina was engaging in what it characterized as a "smear campaign". The National Advertising Review Board and the Advertising Self-Regulatory Council found that Blue Buffalo's advertising was misleading and its claims that competitors were hiding information about their ingredients were unsubstantiated. Blue Buffalo said it disagreed, but would obey the ruling.