Chik-fil-A giving away free food for 'Cow Appreciation Day'

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(CNN) - The fast food chain Chik-fil-A is celebrating its 13th annual 'Cow Appreciation Day'.

Because of Cow Appreciation Day, the restaurant will be giving away free food but only if you are dressed like a cow.

There are even some costume tips on the company's website.

All adult customers have to do is show up in any type of cow attire and you'll get a free entree.

Children who dress up will get a free kid's meal.

Chik-fil-A calls Cow Appreciation Day its largest single day customer appreciation event.

The giveawaywill last until seven pm.