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First and foremost, he must learn to ignore distractions. He must also learn all the things that a dog learns to live among humans, such as where and when to toilet, not to beg or pester, and basic house manners.
Guide dog candidates are intentionally selected from among animals who already have a low prey drive which makes them naturally less likely to chase things like squirrels. They are selected to have calm personalities and sound nerves as well as good physical health .