1 Amazon has a selection of dog training books starting under $10. 2  Some shelters offer low-cost training, starting at about $35 and up for several weeks of classes. 3  The cost is usually lower for a dog adopted from that shelter. 4  Some boarding training programs offer a discount for a second dog from the same household. Amazon has a selection of dog training books starting under $10. 2  Some shelters offer low-cost training, starting at about $35 and up for several weeks of classes. 3  The cost is usually lower for a dog adopted from that shelter. 4  Some boarding training programs offer a discount for a second dog from the same household.
cortices. 1  1a (1) : the outer or superficial part of an organ or bodily structure (such as the kidney, adrenal gland, or cerebellum or a bone); especially : cerebral cortex (2) : the proteinaceous usually pigmented layer of a hair below the cuticleb : the outer part of some organisms (such as paramecia)
In bone surgery, a corticotomy is a cutting of the bone that may or may not split it into two pieces (bone fracture) but involves cortex only, leaving intact the medullary vessels and periosteum. Corticotomy is particularly important in distraction osteogenesis.