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.
The best way to determine if your dog has fleas, even if they are not visible at present, is to use a flea comb on its fur and look for signs of âflea dirtâ. This is commonly found in flea problem areas and is actually their feces and dead skin.