SAN YSIDRO, Calif. — Puppy smugglers continue flooding the market with animals from Mexico, many of which die or pose health hazards to unsuspecting buyers, according to a recent survey. Animal welfare agency inspectors found 517 puppies, many concealed in vehicles and destined for swap meets across Southern California, during the two-week survey earlier this month at the San Ysidro and Otay Mesa ports of entry. [snip] To get them across the border, smugglers often stuff the dogs in packing crates or hide them in spare-tire wheel wells. The puppies are heard whimpering inside trunks or underneath seats. When bringing...