If your dog is lip-licking during a training session, it's probably best to find a way to quickly end on a positive note (ask your dog to do something he knows and wrap up the session). Next time, break down the action or behavior into smaller segments so it's easier for your dog to learn.
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For socket wrenches to fit metric bolts, go here. The tables below show the commonly-available sizes of socket wrench and the fasteners they fit. The 8-pt sockets fit only square heads. A 12-pt socket fits both hexagonal and square heads. Twelve-point sockets also fit 12-pt heads (which are found only in aerospace bolts).