ON THE HUNT A bedbug-sniffing dog at a library in Wichita, Kan.Credit...Steve Hebert for The New York Times READING in bed, once considered a relatively safe pastime, is now seen by some as a riskier proposition. That’s because bedbugs have discovered a new way to hitchhike in and out of beds: library books. It turns out that tiny bedbugs and their eggs can hide in the spines of hardcover books. T