This is just one example of how some dogs hate having their paws touched. When you teach a dog to willingly give his paw, this can diffuse a whole lot of difficult and potentially stressful situations, such as nail clips or drying paws after a walk.
The idea is to replace unpleasant associations between paw contact and people, with the prospect of a tasty treat when he does something as easy as offer up a paw. With a food-motivated dog like a pug, this offer is too good to turn down and in no time at all, he'll be pestering you to take a paw on the off-chance of a reward.
However, when your dog willing gives a paw on cue, he learns to associate that contact with good things likes treats and praise. While you'll need further training to get an anxious dog to accept having his toenails clipped, at least you are halfway there with the 'paw' command.
Another great practical use of giving a paw, is that visitors can ask the dog to greet them by giving a paw. While this doesn't sound much in itself, it actually distracts the dog from jumping up and therefore makes for better behavior when guests arrive.
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