I have recently adopted a Jack Russell Terrier and fell in love with him at first sight. But what I didn’t realize was how much energy this dog has and the patience that is required to train a dog of this such energy. Now maybe in my situation it is a little more difficult because I adopted him at 8 months old so whatever bad habits he has acquired over his life we will have to train him to get rid of them. I have attached a link to this article as a great way to give you an idea of what you are getting yourself into if you are choosing to adopt a Jack Russell Terrier.
Click here : https://www.therealjackrussell.com/advice/tips.php
Yes Jack Russell are handful; requiring a lot of exercise and patience. I run with mine and usually exhausts him enough. Good luck!!!