* First year of a Chihuahua's life is roughly equivalent to 15 human years.
* Each subsequent year is approximately equal to 4-5 human years.
Therefore:
* A 2-year-old Chihuahua is around 24-25 human years old.
* A 5-year-old Chihuahua is around 35-40 human years old.
* A 10-year-old Chihuahua is around 65-75 human years old.
Factors influencing Chihuahua lifespan:
* Breed: Chihuahuas are generally considered small breed dogs, which tend to live longer than larger breeds.
* Genetics: Individual dogs may have different genetic predispositions to certain health issues.
* Lifestyle: Diet, exercise, and overall health care can significantly affect lifespan.
* Environment: Living conditions and exposure to environmental hazards can also play a role.
Average lifespan:
The average lifespan of a Chihuahua is 12-15 years. However, many Chihuahuas live well into their teens and even beyond 20 years with proper care.