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#10 Jackies have a strong hunting instinct, which you should get to grips with before the first walks without a leash.
#11 You won’t get far with the Jack Russell Terrier with violence and he will get his own way.
#12 You must show him that obeying is worthwhile with rewards and positive reinforcement.
It is best to start showing the puppy what it can and cannot do on the first day.