I just went into Canada through the Pigeon River customs entry last weekend on my way to Thunder Bay-No one asked us about Beef products and we had our dogs, and dog food,  in the car. Might be spotty in their asking about beef products. They might also be cooling it off after Bush met with the Canadian PM last week and discussed the beef bans.

I do know people who had dog food confiscated coming into the US from Canada as the US is not only banning beef from entering but chicken products also for aviary stuff.