Dog drinking coca cola!?

Hello! I was at a friends house today and i left my 2L Coke on the ground as we were goin' to use the Trampoline. And then my friends 6 months old golden retriever (spelling) came and carried my coke away. and suddenlty the cap was off and she was drinking the cola. It wasnt much, it was like one Decimeter of cola left. pretty much of it got on the lawn, and i poured the rest out, so she did'nt drink much, but could it hurt the dog or even be lethal to her? Please answer! Thanks in advance!