My pups are like little addicts!

They can hear the egg nog container come out of the fridge and know its egg nog without even seeing it! They climb all over us to get a sip! I read the container and don't see anything ingredients that they cannot have. We've been giving them a sip here and there, not too much as it does have a ton of sugar, but they LOVE this stuff!!!
Anyone know of any reasons why they cannot have a sip or two here and there?
Anyone else have eggnog-aholics at home?