Chihuahuas are often described as “big dogs in small bodies” due to their spirited personalities. They may be small, but they’re filled with energy, spunk, and loyalty. Some Chihuahuas, known as Teacup Chihuahuas, are even smaller than the standard size, sometimes only half the size of a typical Chihuahua.
Let’s explore how big Chihuahuas can get, when they stop growing, and what to expect from their development stages.
Overview: Fun Facts About the Chihuahua
Chihuahuas are one of the smallest dog breeds in the world, but don’t let their size fool you—they have big personalities! Known for their devotion to their owners, these dogs are loyal, alert, and quite playful. There are two main types of Chihuahuas based on head shape: the Apple Head and the Deer Head.
- Apple Head Chihuahuas have a rounder skull and a short muzzle.
- Deer Head Chihuahuas have a longer muzzle and larger ears, often giving them a slightly bigger appearance.
In addition, Chihuahuas can have either a long or short coat, with the American Kennel Club (AKC) accepting both types.
How Big Do Chihuahuas Get?
On average, Chihuahuas reach around 5–8 inches (13–20 cm) in height, with some as small as 3.8 inches (9.65 cm), making them one of the tiniest dog breeds. The smallest Chihuahua on record weighed just 1 pound (0.45 kg) and holds the Guinness World Record for the smallest dog.
Standard Chihuahuas generally weigh under 6 pounds (3 kg), while the smaller Teacup Chihuahuas can weigh closer to 2 pounds (0.9 kg).
Most Chihuahuas reach their full size by 6 to 9 months, significantly faster than larger breeds, which may take up to two years to fully mature.
How Much Should a Chihuahua Weigh?
The average adult Chihuahua typically weighs under 6 pounds (3 kg). Teacup Chihuahuas are even smaller, while oversized Chihuahuas weighing over 12 pounds (5.4 kg) are often mixed with other breeds.
If you’re curious about your Chihuahua puppy’s expected adult weight, our growth chart below offers estimates based on their weight at eight weeks old.
Chihuahua Growth Chart by Weight
Growth charts are a useful tool to help monitor your Chihuahua’s development and ensure they’re on track. However, these charts are only guides, and individual growth rates can vary. For precise guidance, always consult with your veterinarian.
| Weight at 8 Weeks | Estimated Adult Weight |
| 11 oz (0.31 kg) | 2 lbs (0.9 kg) |
| 13 oz (0.36 kg) | 2.5 lbs (1.13 kg) |
| 1 lb (0.45 kg) | 3 lbs (1.36 kg) |
| 1.18 lbs (0.53 kg) | 3.5 lbs (1.58 kg) |
| 1.34 lbs (0.60 kg) | 4 lbs (1.81 kg) |
| 1.5 lbs (0.68 kg) | 4.5 lbs (2.05 kg) |
| 1.68 lbs (0.76 kg) | 5 lbs (2.26 kg) |
| 2.06 lbs (0.93 kg) | 5.5 lbs (2.5 kg) |
| 2.44 lbs (1.10 kg) | 6 lbs (2.72 kg) |
This chart provides a rough estimate for both male and female Chihuahuas. If your puppy’s weight falls outside these ranges, consult your veterinarian for a health assessment.
Chihuahua Puppy Growth Stages
Ensuring your Chihuahua puppy grows and develops well is crucial for their health and happiness. Alongside monitoring their weight, providing age-appropriate stimulation can help them become well-adjusted adults. Here’s a detailed breakdown of their growth stages and what to expect.
0 to 2 Weeks Old: Newborn Phase
Newborn Chihuahua puppies, from birth to two weeks old, are tiny and delicate, weighing only a few ounces or grams. During this phase, they experience rapid growth, often doubling in size within days. These pups are highly vulnerable to cold and must be kept in a warm, safe environment to prevent life-threatening hypothermia.
At this stage, they rely completely on their mother for nourishment and warmth, with their eyes and ears remaining closed.
3 to 15 Weeks Old: Socialization Phase
Between three and fifteen weeks old, Chihuahuas enter their critical socialization phase. Their rapid growth from the newborn stage slows, but they should continue to gain weight steadily. Any significant plateaus could indicate a health issue and require veterinary attention.
During this time, they should be handled gently to acclimate them to human interaction. This is also when they begin exploring their environment and building confidence. By the time they reach eight weeks old, they should have received their first vaccinations and be ready for rehoming. Introducing them to various safe stimuli during this period helps reduce fear and anxiety as they grow.
4 to 9 Months Old: Adolescence and Ranking Phase
Chihuahuas reach much of their adult size between 4 to 9 months. By this stage, they’re gaining weight more than height. They may experience separation anxiety and enter a “ranking” phase, where they learn the household rules. Avoid reinforcing “small dog syndrome” by carrying them constantly; allow them to build confidence independently.
10 to 18 Months Old: Transition to Adulthood
By ten to eighteen months old, your Chihuahua will transition into adulthood. If they haven’t already reached their full size, they will complete their growth during this phase. They lose their puppy fat, giving them a more defined and sleek appearance, often accompanied by a slight broadening of the chest, which is entirely normal.
At this stage, Chihuahuas exhibit mature and stable behavior, remaining alert but not overly hyper. Growth plateaus completely after eighteen months, and any additional weight gain should be monitored to prevent health issues.
Factors Influencing Chihuahua Growth
While genetics plays a big role in determining a Chihuahua’s size, other factors can affect their growth rate and overall health.
Nutrition
Proper nutrition is crucial. Chihuahuas require a diet formulated for small breeds, containing balanced protein, calcium, and other nutrients essential for growth. Insufficient nutrition can lead to stunted growth, while a diet high in unhealthy fillers can cause obesity.
Physical Activity
Chihuahuas are delicate and prone to injury. Excessive activity, especially jumping from high places, can harm their developing joints. Supervise their activity levels and avoid high-impact exercises until they’re fully grown.
Health Issues
Chihuahuas are relatively healthy but may suffer from low blood sugar due to their small size. Parasites like roundworms or whipworms can stunt growth if untreated. Regular vet check-ups and a deworming schedule are essential.
Considering the various Chihuahua colors, it’s not just size and health that add to their charm but appearance too.
Frequently Asked Questions About Chihuahua Growth
Here are answers to some common questions about Chihuahua growth and development.
How Can I Tell If My Chihuahua Is at a Healthy Weight?
A healthy Chihuahua will have a slight waist when viewed from above, and you should be able to feel (but not see) their ribs. Overfeeding can lead to obesity, while underfeeding can cause malnutrition. Consult your vet if you’re unsure about your Chihuahua’s weight.
What’s the Best Way to Weigh a Chihuahua?
For tiny Chihuahuas, use a kitchen food scale for accuracy. Human scales often lack sensitivity for such lightweights. Weigh them weekly during puppyhood to track their growth.
Does Neutering or Spaying Affect a Chihuahua’s Growth?
Neutering or spaying doesn’t significantly impact a Chihuahua’s growth. However, spaying females before their first heat cycle is recommended to avoid territorial behaviors. Consult your vet for the best timing based on your dog’s health.
What Health Issues Can Affect Chihuahua Growth?
Chihuahuas may experience low blood sugar, making it important to feed them small, frequent meals. Parasites or infections can also hinder growth. Regular vet visits and preventive care are essential to ensure healthy development.
When Do Chihuahuas Stop Growing?
Most Chihuahuas reach their full height by 6 to 9 months. By one year, their growth usually plateaus. In rare cases, some may grow until they’re around two years old.
Their amazing adaptability is also evident among Chihuahua mixes, where growth and temperament can differ based on hybrid vigor.
What’s the Ideal Age to Spay or Neuter a Chihuahua?
Spaying females before their first heat cycle, typically around 6 to 8 months, is ideal. For males, neutering before six months can help prevent territorial behaviors. However, consult your vet to determine the best time based on your Chihuahua’s specific needs.
Will My Chihuahua Grow After Neutering?
Yes, neutering does not affect a Chihuahua’s growth. Neutering may impact hormone-related behaviors, but your Chihuahua will continue growing until they reach their genetic potential.
Is Your Chihuahua on Track?
Understanding Chihuahua lifespan as it relates to growth stages is essential. Chihuahuas may be small, but they are one of the most spirited breeds you can find. By understanding your Chihuahua’s growth stages, you can better support their development and ensure they thrive. Regular check-ups with your vet, balanced nutrition, and a safe environment will help your Chihuahua grow into a healthy, happy adult.
Did your Chihuahua meet the growth milestones on our chart? Let us know in the comments below!