The "Happy Cow" ad campaign in California, which is sponsored by the Milk Advisory Board and California Department of Agriculture, has recently come under scrutiny from PETA (People for the Ethical Treatment of Animals). PETA has sued both parties claiming that they need to prove that California cows are truly happy before they can continue running the ads.

"The milk advisory board continues to tell consumers about the great standards of care that cows receive," said Martina Bernstein, senior litigation counsel for PETA. "There has been absolutely no evidence to that fact. If they have this evidence, they should be required to show it."

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Photo by Bob Jagendorf