Calculating Your Puppy’s Adult Weight

So you’ve adopted a new puppy and you’d like to get an idea of how big he/she will grow up to be.

• Is there any way to tell, or at least to guess, how big your little furball will be as an adult dog?
• Is it okay to buy your dog small-sized supplies, such as beds, or should you save some money and opt for the large size now?
• Are there any health issues associated with your pooch’s future size that you should start researching now?

Knowing how large your dog will become can be very useful for many reasons. Of course, we love our dogs no matter what size they are, but if you’d like a way to estimate how big your puppy will grow to be, then you’re in the right place!

Easy Calculations:

• Determine how old your dog is in weeks, and weigh your puppy.
• Now here’s where the actual math comes in. The formula is (Growth) = Current weight in pounds / Age in weeks.  Adult Weight = (Growth) X 52
• For example, say you have a 12-week-old Chihuahua mix who currently weighs six pounds. You’d first determine his growth. So current weight divided by age in weeks. 6/12 = 0.5. Then you take that growth number, in this case, 0.5, and plug it into the next equation. So in this example, the dog’s adult weight is equal to 0.5 X 52, which is 26. So the Chihuahua mix in this example has an estimated adult weight of around 26 lbs.

Pretty simple, right? Keep in mind, though, that this is just a rough estimate. There are many factors that go into determining a dog’s growth and size, including things like sex, breed, and health.  This calculation assumes that a puppy will continue to grow at a consistently average rate until they reach adulthood.

Kitsune when he was a puppy!

But that may not be entirely accurate due to the fact that many puppies, rather than growing continuously, will have a period of fast growth followed by a period of slower growth until they reach their full adult weight.

Different-sized dogs also reach their adult size at different ages, and even after they obtain their adult size, it’s normal for them to continue to gain some weight as they fill out more.

Since these calculations are just estimates and can be inaccurate, it can be helpful to look at more than one when trying to determine your dog’s future size. Here is an example of another set of equations used to estimate a puppy’s adult size.

1. If you have a toy or small breed dog, use this equation: (Adult weight in lbs.) = weight in lbs. at six weeks old X 4.
2. If you have a medium or large-sized dog, use this equation: (Adult weight in lbs.) = weight in lbs. at 14 weeks X 2.5.
3. If you are unsure whether your dog will be a small, medium, or large adult, you can do both of these calculations for your dog to get a weight range.

Dogs come in all shapes and sizes. It’s important to love our dogs, no matter how large or small they grow up to be. But if you’d like a rough estimate of your dog’s adult size, these simple calculations should help.

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