* Fox Terrier: They can live between 12-15 years.
* Chihuahua: They typically live for 12-18 years, with some living even longer.
If you're interested in a mixed breed dog, it's impossible to say exactly how long it will live. However, it's likely to fall somewhere within the range of its parent breeds.
A mixed breed dog can also have unique traits and health considerations, so it's important to talk to a veterinarian for personalized advice.