If you have ever wondered whether your Chihuahua puppy is growing on track, a chihuahua size chart can really put your mind at ease. I remember constantly weighing my Chi as a puppy, worried she was too small or growing too fast. Turns out, most Chihuahua owners go through the exact same anxious weighing routine.
Birth to 8 Weeks
Chihuahua puppies are incredibly tiny at birth. Most weigh somewhere between 2.5 and 5.5 ounces. That is small enough to fit in the palm of your hand with room to spare. During these first weeks, they grow quickly and should roughly double their birth weight within the first week or two.
By 4 weeks old, puppies are starting to wobble around on their tiny legs and will typically weigh between 7 ounces and 1.5 pounds. By 8 weeks old, a Chihuahua puppy typically weighs between 11 ounces and 2 pounds depending on their expected adult size. I learned the hard way that comparing your puppy to others in the litter is not always helpful because there can be a big range even among siblings.
3 to 6 Months: The Big Growth Phase
This is when things really start to change. Between 3 and 6 months, your Chihuahua puppy will do most of their growing. A puppy that will be around 4 pounds as an adult might weigh about 1.5 to 2.5 pounds at 3 months and closer to 3 to 3.5 pounds by 6 months.
Bigger Chihuahuas heading toward the 6 pound range might already be around 4 pounds at the 6 month mark. Every chihuahua is different, so try not to stress over exact numbers. The trend matters more than any single weigh in. If your puppy is gaining steadily and your vet is happy, you are on the right track.
During this phase, your puppy will also start teething, which can sometimes cause a temporary dip in appetite. Do not panic if they eat a little less for a few days. Just make sure fresh water is always available.
When Do Chihuahuas Stop Growing
Most Chihuahuas reach their full adult size between 9 and 12 months old. Some fill out a little more up to 18 months, especially in the chest and body. But height and length are usually set by their first birthday.
My Chi hit her adult weight at about 10 months and then stayed pretty consistent after that. The AKC breed standard lists the ideal weight as not exceeding 6 pounds, but plenty of healthy Chihuahuas weigh more than that, especially deer head types who tend to run larger.
General Weight Expectations
Here is a rough guide for what to expect at different ages based on birth weight. A puppy born at 2.5 ounces will likely be a very small adult around 2 to 3 pounds. A puppy born at 3.5 to 4 ounces typically ends up between 3 and 4.5 pounds. A puppy born at 5 ounces or more will likely end up closer to 5 or 6 pounds as an adult.
At 4 weeks, expect about 7 ounces to 1.5 pounds. At 8 weeks, around 11 ounces to 2 pounds. At 3 months, roughly 1.5 to 3 pounds. At 6 months, roughly 2.5 to 4.5 pounds. And at 12 months, your Chi should be at or very near their adult weight of 2 to 6 pounds.
Keeping Your Chihuahua at a Healthy Weight
Once your Chihuahua is fully grown, maintaining a healthy weight becomes the priority. These little chihuahuas gain weight easily because it does not take many extra calories to add an ounce on a 5 pound dog. I keep treats small and measure food portions carefully rather than free feeding.
You should be able to feel your Chihuahua’s ribs without pressing hard, but they should not be visibly sticking out. If you run your hands along their sides and cannot find the ribs at all, it might be time to cut back on portions.
If you are ever unsure about your Chihuahua’s growth or weight, talk to your vet. They can assess body condition much better than any chihuahua size chart can. A chart is a great starting point, but your vet knows your specific dog best.
You might also like: deer head vs apple head Chihuahuas and long hair vs short hair Chihuahuas.
