Traditionally - milk and biscuits (cookies in america!)
Cookies and milk
If your dog eats your snack for santa you shouldn't be worried. Santa eats MILLIONS of cookies during that one special night. He knows you left them. Next year, try leaving a drawing or a thank you letter to santa. They are less appealing to the dogs tastebuds as well as a break for Santa from eating all those cookies.
== == I used to leave cookies, and now I instruct my daughter to do the same. Santa isn't picky, he's usually happy with whatever you choose to leave out. == ==
Milk and cookies is traditional
Ireland
usually cookies and milk and carrots for the reindeer.
ugh...cookies and milk xD ~ Michael
Many people leave Santa cookies and milk, and leave carrots and water for the reindeer.
In the United States, it is customary first for children to give or send a Christmas gift wishlist to Santa. On Christmas Eve, then, they often leave out cookies and milk for Santa and, in some homes, carrots for the reindeer. Similar customs exist throughout Europe, where some drink and snack is left for the jolly gift-giver.
Carrots.
Italy, because it's where they originated.
Mayamalavagowla