Chihuahua
The Chihuahua is the world's smallest recognized dog breed, with ancient roots tracing to the Techichi dogs of pre-Columbian Mexico. Available in smooth and long coat varieties, Chihuahuas pack enormous personality into a body that typically weighs 2-6 pounds. Fiercely loyal to their chosen person, they are alert, sassy companions who often don't realize their diminutive size.
14–18
years lifespan
3–6
lbs (male)
5–8
inches tall (male)
moderate
energy level
Temperament
How Old Is Your Chihuahua in Human Years?
Use our breed-specific calculator to find out, plus get personalised health and care guidance for your dog’s exact age.
Open Chihuahua Age CalculatorCommon Health Conditions
Dental Disease
Small breeds prone to severe dental disease.
Typical onset: 1–3 years
Patellar Luxation
Kneecap displacement common in small/medium breeds.
Typical onset: 1–5 years
Hydrocephalus
Fluid accumulation in brain. Common in apple-head Chihuahuas.
Typical onset: 0–1 years
Collapsing Trachea
Progressive tracheal cartilage weakening.
Typical onset: 3–8 years
Patent Ductus Arteriosus (PDA)
Congenital heart defect.
Typical onset: 0–1 years
Lifespan Factors
The median lifespan for a Chihuahua is 16 years. Key factors that influence longevity:
- dental disease
- patellar luxation
- hydrocephalus
- collapsing trachea
- heart disease
When Is a Chihuahua Considered Senior?
Chihuahuas are generally considered senior at around 10 years of age. At this point, you should increase vet visits to twice yearly and watch for age-related health changes.
Check your Chihuahua’s age in human years →