I would check with both the US & Canadien Customs offices to find out what is required to bring a dog into Canada as well as the US. I believe that the US Border Patrol is more interested in humans and illegal substances entering the US. This may seem obvious, but ... you're bringing a dog into TWO countries - first Canada and then the US when you return. It's one trip to you, but they may not be seen that way by the respective Customs officials in terms of your dog. Usually you need proof of vaccination, and certificates are the proof. But, do check with them, and DON'T assume that each country requires the same documentation.