Use this Chihuahua puppy weight calculator to predict how big your puppy will get. Chihuahuas are a toy breed that typically reaches full size by around 9-12 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
Indoor/outdoor enclosure — a good fit for toy and small breeds.
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| Age | Weight |
|---|---|
| Birth | 0.1 to 0.2 lbs |
| 2 Months | 2 lbs |
| 3 Months | 2 lbs |
| 4 Months | 3 lbs |
| 5 Months | 3 to 4 lbs |
| 6 Months | 4 lbs |
| 7 Months | 5 lbs |
| 9 Months | 5 lbs |
| 10 Months | 6 lbs |
| 1 Year | 6 lbs |
| 1.5 Years | 6 lbs |
| 2 Years | 6 lbs |
Estimated from typical toy-breed growth curves and the Chihuahua's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Chihuahuas are prone to patellar luxation, a soft spot in the skull called a molera that's common in puppies (usually closes with age), and dental crowding leading to periodontal disease given their tiny jaw. Despite their size, Chihuahuas tend to live long — often into their mid-teens — but are prone to obesity if overfed.
Small, measured portions of a quality small-breed diet; because they're so small, even modest overfeeding shows up as a large proportional weight gain.
Minimal — both smooth and long coat varieties need just occasional brushing. Dental care matters more than coat care for this breed.
Intelligent but can be strong-willed; consistent, positive-reinforcement training and early socialization help offset a tendency toward wariness of strangers or other dogs that's common in very small breeds.
The Chihuahua is named for the Mexican state where 19th-century American travelers first found small dogs being sold, though the breed's ancestry likely traces back further to the Techichi, a companion dog kept by pre-Columbian civilizations in Mexico. It's the smallest recognized dog breed and one of the oldest breeds native to the Americas.
Chihuahuas are known for outsized personality and devotion to their people — often intensely loyal to one person — packed into a body that can weigh as little as a few pounds.
