A Puppy Lover's Utopia

How Big Will My Puppy Get?

How Big Will My Puppy Get?

Unless you are going to be buying or adopting a purebred dog breed (whose puppy growth rate is fairly predictable) you’ll likely be wondering how big will my puppy get?
Puppy Growth Calculator
This is especially true when you’re considering mixed dog breeds because there are a variety of factors at play.  Among these are uncertainty surrounding the lineage of the puppy (who its parents are) as well as the puppy’s age.

However, there are a few things that you can use to estimate what size your puppy will eventually reach no matter what mix of breeds it might be.

Estimating Puppy Growth Development

  • Look at the size of the puppy’s paws.

    Just like people, the size of a puppy’s feet are a fairly reliable predictor about the size that the dog will ultimately reach.  Obviously large breed dogs are going to have correspondingly large paws while on the other hand small and medium breed puppies will have smaller paws.

  • Check for sagging skin.

    If you’re mixed breed puppy appears to have some degree of loose skin on its body then there is a likelihood that when it grows into an adult it will also grow into this skin.

  • Use some puppy growth chart estimates.

    A little-known process involves tracking a puppy’s growth over a period of time.  In general, puppy growth is at its speediest from the time that it’s born until it reaches about six months of age. After that growth will taper off until about one year when it is almost full-grown. For example, if a pure breed dog is supposed to weigh approximately 50 pounds when full-grown then a few simple calculations can be made.  Starting at about the four-week mark such a dog would gain approximately 1.25 pounds per week until it plateaus at about 95% of its eventual weight. As an alternative, a simple rule of thumb simply states that to figure out a dog’s eventual weight all you need to do is double how much it weighs at around the 14 week mark.

Collectively, using some or all of these calculations should give you some clue as to the rate at which your puppy will grow.  Keep in mind that although you will experience puppy growth spurts that such estimations of your dog’s final weight should be relatively reliable.  Lastly, if you’re still unsure be certain to ask your vet what he or she thinks since they’ve probably seen dogs like yours before.

A Simple Puppy Growth Calculator Can Help as Well

One very basic method involves considering your dog’s frame (small medium or large) and breed to help identify its eventual full grown size.  You’ll also need to know the puppy’s age in terms of weeks.

  • For small puppies, take the measurement at 12 weeks of age
  • For medium puppies, take the measurement at 16 weeks of age
  • For large puppies, take the measurement at 20 weeks of age

For example, a small puppy that weighs 3 pounds pounds at 12 weeks of age and has a projected adult weight of 10 pounds could be estimated by using the following formula…

Take the current weight and divide it by the age in weeks.  Take the results of that formula and then multiply it by 52 weeks.  So, the formula for calculating the size of the puppy in the example above would be as follows:

  • Estimated final growth = 3 pounds/12 weeks = .25 pounds per week
  • Final adult weight = .25 pounds per week × 52 weeks = 13 pounds

Use Our Handy Calculator to Chart Your Puppy’s Final Adult Weight!

IMPORTANT: In order to get an accurate estimate, you will need to a scale so that you can weigh your dog first!


Of course no one wants to be caught off guard wondering how big will my puppy get, so hopefully by using one or more of the calculations above you’ll be able to plan for the full-grown version of your puppy pal.