Four years ago, Amanda and Bob Metzger of Exton, Pennsylvania, saw an ad for golden retriever puppies in the local newspaper and went to have a look. "Once we saw them," says Amanda, "we fell in love. We couldn't have left the place without one." They decided on a dog they named Jake -- but being careful consumers, the Metzgers made sure the breeders had a solid reputation, insisted on an American Kennel Club certification of Jake's pedigree and got assurances that his parents were free of health problems before they handed over $325 for their dog.
Their troubles started three...