Use this handy calculator to approximate the adult size of your puppy.

Which Calculator to use?

  • Small Dog Calculator: If your dog is considered small, meaning her mom was less than 25 pounds in weight and 40 cm (18 inches) at the withers. (basically shoulder)
  • Large Dog Calculator: If your dog’s mom is considered Med/Large, meaning her size ranged from 25 to 60 plus pounds in weight and up 60 cm (27 inches) at the withers

What You Need

Mother Size

Tape Measure

Home Scales

Pencil

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Adult Weight Calculator:

To estimate your puppy’s adult weight, you will need to know her weight at 7 weeks old.  Your vet may tell you at your first vet visit or you can use your home scales to weight your puppy.

Here’s how:

  1. weigh yourself first. Write down the number.
  2. Hold your puppy and weigh yourself again.
  3. Subtract the first weight from the second and you will be left with your puppy’s weight.
  4. Input that number into the appropriate calculator, small dog or med/large dog.

Your pup is considered small or med/large based on the size of his mother.

Adult Height Calculator:

To estimate your pup’s approximate adult height, you will need to know your puppy’s height at the withers at 6 months old.

  1. Stand your puppy against a wall making sure she has her weight distributed on all 4 feet. You can let her nibble of a treat to keep her still.
  2. Gently place a pencil on her withers with the lead part facing the wall.  Using the pencil, make a small mark on the wall at the height of her withers.  Give your puppy the treat and let her go.
  3. Use your tape measure to calculate the distance from the floor to the mark on the wall.  That is your puppy’s height at the shoulder.
  4. Input that number into the appropriate calculator, small dog or med/large dog.

Your pup is considered small or med/large based on the size of his mother.

Keep in mind:

  • Small dogs reach physical maturity at about 12 months old.
  • Medium/ large dogs can take up to 2 years to reach physical maturity.