I just went from the US to England, and then from Spain to the US, and no bad was opened either way out of our whole group of 39. I think this was prolly a somewhat freak accident, but we also saw no dogs goign either way or while we went from country to country in our tour of Europe.

On a side note, finding pot is easier then you would think. We found it all four of the times that we really wanted it. Just have to be willing to grow some balls and ask strangers.