Jack is
<span class="navinc" title="joan">Joan's</span> replacement for <span class="navinc" title="jessica">Jessica</span> and <span class="navinc" title="jayna">Jayna</span> while they have been gone in college and high school. He is a Jack Russell Terrier mixed with a Beagle, and weighs in at a hefty 19lbs&#33; He loves to bark at nothing and get into growling fights with  <span class="navinc" title="dwight">Dwight</span>. Although he has a continuously bad attitude and is always fighting with <span class="navinc" title="joan">Joan</span>, he fits right into the family.