2) 2. Jack Russell Terrier: The High-Voltage Reactor
Jack Russell Terriers are famous for energy, drive, and determination, but those traits can become a problem under stress. They are quick thinkers, quick movers, and sometimes quick to bite if frustrated or overstimulated. A Jack Russell that is bored, under-exercised, or constantly corrected may become increasingly tense and reactive. Their strong prey drive and intense focus can also make them difficult to redirect once they’re emotionally charged. They need jobs, structure, and plenty of physical and mental outlets to stay balanced and avoid sharp defensive behavior.