The border traverses a variety of terrains, ranging from major urban areas to uninhabitable deserts. Approximately 350 million legal crossings occur annually, and is the most frequently crossed border in the world. The total length of the continental border is 1,954 miles (3,145 km).
Only a veterinarian will know what's wrong with your dog but usually stumbling, wobbling and falling down is associated with neurological problems, especially if there aren't any other signs. I would really take him to the vet as soon as you can.
Just warm clothing, gloves etc. and a helmet. Ski poles should not be used. Sled Dogs Snowskates are also super-compact for transport back and forth to and from the ski slopes. We do offer some accessories that may be useful: Doggie walkers are a quick-slip-on cover for the dogs for use when walking on pavement, gravel etc. Another great thing about Sled Dogs Snowskates is that you can walk around anywhere but we recommend Doggy Walkers for extending the life of your dogs.