Every dog trainer this side of Cesar Millan knows that most of the job is about training the owners; even so, some mutts need a lot more whispering than others. The Humane Society of Boulder Valley offers a wide range of programs for different needs, from introductory workshops on "dog learning styles" to courses on puppy socialization and how to acclimate Shep to the arrival of a new baby. Most impressive, though, are the "Grumpy Growler" classes for those struggling with aggressive canines. Run by two instructors, limited to six dogs per session and costing $150 for a six-week course, this is no walk in the park. But it's cheaper than a lawsuit, and graduates swear by the results.