If you dug a hole through the centre of the earth,
where would you come out?
How many kids have started digging a hole through the earth "to China"? Well, where would you come out? It turns out only kids (or dogs) digging from southern South America would end up in China - from almost everywhere else (except New Zealand and Spain) they'd end up under the sea. All of the contiguous United States are opposite the Indian Ocean. Still, this map will be a fascinating talking point, whether you wear it or display it. For your dog to wear it would be a great talking point. Where on earth is furthest away from you? This map will show you.
Oh, and don't dig that hole, wherever you are - the centre of the earth is molten.*(Most people say "an-TIP-o-deez".)