Not sure about a site, but I'm sure if you did a quick google search you'd come up with something. My cat has been across the border numerous times and we've never had trouble. Cats are supposed to be vaccinated against rabies, but I take a certificate signed by my vet saying everything she's vaccinated against, which includes rabies. I haven't brought my dog yet because my parents were willing to keep her for the time I spent in Canada, but as far as I know, just proof of vaccinations again.