If you love dogs, you'll be thinking about where you retire with an additional filter. Is the city or town friendly to Fido? Are there active 50+ communities that are especially tailored to pets?

Arlington, VA, is going to the dogs and to the seniors who like to stay in shape. Chula Vista, CA, is "sick" when it comes to skate parks. And the most heavily visited park in America is an old freight rail line.

It stands to reason that if dogs can sniff out cancer cells in humans, detect bombs, and locate lost people, might they also be the key to finding your perfect match?