If you are currently in the process of picking a dog, then you might find it helpful to learn which breeds are the hardest to train. JustAnswer’s resident dog behavior expert, Sally Grottini, has over 30 years of experience in the dog training field. When she’s not teaching pooches to behave, Sally also works as a Therapy Dog & AKC Evaluator and with service dogs. Here are her top picks for the hardest breeds to train. Chow- ChowAs literal bundles of fur, Chow Chows are one of the more popular breeds in the United States. Unfortunately, and despite their popularity, they are also known to be s…