Bring vaccination certificates for pets
Dogs and cats from the U.S. that are at least three months old need signed and dated certificates from a veterinarian verifying that they have been vaccinated against rabies within the last three years. The certificate must clearly identify the animal. If your dogs or cats are less than three months old, you do not need a certificate of rabies vaccination - however, the animals must be in good health when they arrive.とCCRAのサイトにあります。
ボーダーでRabiesのCertificateを持っているか聞かれます。(聞かれなかったこともありますが...)有効なCertificateをみせればOKでした。とりあえず今まで何度か陸路でUS/Canadaボーダーを犬と越えましたが、OfficerもCertificateを一瞥するだけで特に何もありませんでした。
詳細がCFIA↓にあります
http://www.inspection.gc.ca/english/anima/heasan/import/dogse.shtml