Jacks tend to be aggressive towards other dogs, especially those of the same sex. Their hunting history strongly influenced how determined they are to pursue a prey.
On April 29, 2007, a Jack Russell named George rescued five kids at a carnival in New Zealand from an attack by two pit bulls. He was awarded the PDSA Gold Medal two years later, and also has a statue built in Manaia, New Zealand, in memory of him.
The 1994 film The Mask featured a Jack Russell named Max, who played the role of Milo. Max also starred as the female dog Audrey in the 2000 film Mr. Accident.