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.
What to do if You Suspect Heat Stroke. 1  First, move your dog out of the heat and away from the sun right away. 2  Begin cooling your dog with cool water. 3  You may place wet rags or washcloths on the foot pads and around the head, but replace them frequently as they warm up.