Some say the dogs were a victim of progress. Others suggest it was a test of wills, and the little dogs simply succumbed to the bigger dogs. But many who were munching on the $1.84 hot dog and fries combo Friday night were less concerned with what killed this celebrated and scruffy little hot dog stand under the Fullerton L station than with the fact it was the last time they'd ever walk through its door. After work. Or headed to a Cubs game. Or just to grab a quick lunch. At age 22, Demon Dogs, of Lincoln Park, is...