Chihuahua Puppy Weight Calculator

Calculate the adult weight for your Chihuahua. Just type your puppy’s current weight and age, and see how big your puppy gets.

Chihuahua Growth Guide

Breed Overview

The Chihuahua is one of the oldest and smallest dog breeds, believed to descend from the Techichi dogs kept by the ancient Toltecs of Mexico. Today’s Chihuahua is known for its spunky personality, fierce loyalty, and compact size. Despite their tiny stature, Chihuahuas are bold, alert, and can be excellent watchdogs. They come in smooth or long coats and thrive as affectionate companions.

Chihuahuas are firmly in the toy breed (small) category, with adults typically weighing between 2–6 pounds. Because their bodies are so small, even minor fluctuations in weight can have a big health impact. Growth tracking is essential to ensure they develop properly and stay within healthy weight limits during critical early development stages.

Learn more from the American Kennel Club

Chihuahua Growth Chart & Weight Ranges

Here’s a general breakdown of average weight ranges for Chihuahua puppies. Gender differences are minimal, though males may be slightly heavier by 0.5–1 lb in some cases.

Age	Average Weight Range
4 weeks	0.5–1.25 lbs
8 weeks	1–2 lbs
3 months	1.5–3 lbs
4 months	2–3.5 lbs
5 months	2.5–4 lbs
6 months	2.75–4.5 lbs
9 months	3–5.5 lbs
12 months	3.5–6 lbs (adult size)

How Much Bigger Will My Chihuahua Puppy Get?

Chihuahuas grow rapidly in the first few months and reach 50% of their adult weight by around 8–10 weeks. Most Chihuahuas are done growing by 9–12 months, although very small individuals may mature earlier.

Rule of Thumb:
To estimate adult weight, double your Chihuahua’s weight at 12 weeks. For example, a 2 lb puppy at 12 weeks will likely weigh around 4 lbs fully grown.

Chihuahuas are an exception to the extended growth timelines of larger breeds—they mature much earlier, making early nutrition and care especially important.

Chihuahua Growth Tips

Nutrition

Chihuahuas require a small-breed puppy formula with calorie-dense nutrition to support their high metabolism and small stomach size. Feed 3–4 small meals per day until 6 months, then transition to 2 meals daily. Avoid free feeding, as Chihuahuas are prone to weight gain and dental issues.

Exercise

Short bursts of activity are ideal—indoor play, short walks, and safe socialization with other small dogs work well. Avoid overexertion or rough play, especially with larger pets, as Chihuahuas are fragile and can be injured easily.

Health Watch

Common growth-related concerns include hypoglycemia in puppies, especially under 3 months of age, as well as luxating patella and dental overcrowding due to their tiny mouths. Regular vet visits and early intervention are key to ensuring lifelong health.