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.
Behaving sensibly around dogs. 1  1. Resist petting a stray dog or even a dog that is out walking with its owner. 2  2. Control your emotions as much as you can if a dog threatens to attack. 3  3. Stop jogging or slow down your walk.  4. Speak to any harassing dog in a firm, calm voice.