I went to Canada a few weeks ago, and will be going back at the end of the month. Going into Canada from NY they didn't ask us for any ID, just asked what we were going for (dropping a dog off for shows) and how long we were going to be there, then just said have a good time and that was it. On the way out of Canada (we crossed in Cornwall, ON) they just asked us for drivers licenses and that was it, pretty easy.