However, their lifespan can vary depending on factors like:
* Genetics: Some lines are predisposed to certain health issues.
* Diet and exercise: A healthy diet and regular exercise can extend their lifespan.
* Medical care: Regular vet checkups and prompt treatment for any health problems are crucial.
* Environment: A safe and loving environment can contribute to a longer life.
It's important to note that these are just averages. Some Jack Russells may live longer, while others may have shorter lifespans.