How to Calculate Adult Dog Weight During Puppyhood

By Jennifer Reniker


"So, how big will he get?" is one of the most asked question about puppies. Purebred puppies are relatively easy to estimate an adult weight. You know if you purchase or adopt a Yorkie you will not end up with a 50 pound dog. Estimating the adult weight of mixed-breed puppies is a little more difficult. For a simple cross of say a Labrador and a Beagle you know that the resulting puppies will not weigh more than a Labrador or less than a Beagle. When mixes become more complex you will have to decide if your puppy is a toy/small breed, a medium/large breed or a giant breed. Have your veterinarian or a professional at a shelter classify your puppy.

Step 1

Obtain the weight of the sire (father) and dam (mother) of purebred puppies. Female puppies will weigh about what their dam weighs. Male puppies will weigh about what their sire weighs.

Step 2

Ask your veterinarian or shelter adoption counselor if your puppy is a toy/small, medium/large or giant breed. Toy/small breed puppies are pugs, poodles and most terriers, and will not exceed 20 pounds. Medium/large breed puppies tend to be working breeds like collies, shepherds and labs, and will not exceed 80 pounds. Giant breeds are mastiffs, and any breed with "great" like Great Danes or great Pyrenees, and can reach 200 pounds.

Step 3

Take the weight of small or toy mixed-breed puppies and double their weight at 6 weeks. Take the total and double again. This is about what the puppy will weigh as an adult. For example, if your puppy weighs 2 pounds at six weeks, double it to get 4 pounds and then double again to get 8 pounds.

Step 4

Take the weight of your medium to large mixed-breed puppy at 14 weeks and multiple it by 2. Halve the weight of your puppy at 14 weeks and add it to the total of the weight at 14 weeks multiplied by 2. For example, if your puppy weighs 20 pounds at 14 weeks multiple 20 by 2 to get 40 pounds. Add 10 pounds (1/2 of 20) to the 40 pounds. Your puppy's adult weight will be about 50 pounds.

Step 5

Take the weight of your giant mixed-breed puppy at 6 months and double it. For example: if your puppy weighs 60 pounds at 6 months his adult weight will be about 120 pounds.
Comments (5)
Jun 18, 2012 camianne878
Hello! I recently have purchased a Pomsky puppy. His mom is a Husky and his dad is a Pomeranian. I was wondering which calculation I should probably go with. He is 3.6 lbs at 5 weeks. Help please? :)
Sep 3, 2012 viktoria
I found a puppy the end of May,,,he was starving and infested with ticks,,,the vet estimated he was 6 weeks old and resembles a plott hound. He weighed 13.9 po unds at that time. He now weighs over 50 pounds at close to 5 months old,,does anyone have knowledge of this breed that could give me an idea of how big he is gonna get??? He is doing very well in obedience class ,,,very smart dog,,, Thank you for any help!
Sep 10, 2012 aspartame.queen
Viktoria, I have had multiple Plot hounds and none were that big as puppies. The largest we had grew to 65 pounds, but at 6 weeks he was only 9 pounds. Others we've had never went beyond the low 50s range. These dogs were very healthy. It really depends on the bloodline, but I'm gonna say your pup probably has Dane or Mastiff in him. Plotts resemble these dogs so it is likely your vet mistook him, but he is just going by looks. Your pup seems to have already surpassed the adult weight to be a Plott, but it is very possible it has one in its bloodline. If you go by that chart, it looks like you'll have a very large dog.
Nov 17, 2012 jacqueline.cheshure
You can buy a DNA kit for $65.00 at some pet stores. its a simple Q-tip type swab, you mail it in and they can tell you the mix of your dog, it's parents.
Nov 11, 2013 DavinaDavid
I have a 3 month old Rottweiler/German Shepard mix and he weighs around 40 pounds right now and he's apparently underweight. He doubles in size basically every 2 weeks so it's hard to use this. Can anyone tell me how big he might get? His alleged father was massive and his mom was average sized.
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