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True, guessing an adult dog’s weight by their puppy weight is a bit of a challenge… kind of like guessing an adult human’s weight by how large a child they were!

These guidelines, however, at least gives you a start.


Puppies at different ages grow at different rates, and puppies of different breeds grow at different rates.

Generally, an adult dog will weigh about twice as much as he did when he was 4 months of age

Studies indicate that you can expect a small or medium breed puppy to reach 99% of it’s adult weight somewhere between 9 and 10 months of age.


Remember, this is only an estimate and it is impossible to predict the adult weight of a puppy.  This is a good tool but  the actual weight of your puppy can and probably will vary.

Toy to Small Breeds – weight at 6 weeks x 4 = adult weight.

weight at 8 weeks x 3 = adult weight

weight at 12 weeks x 2 = adult weight

Medium to Large Breeds – weight at 14 weeks x 2.5 = adult weight
Large to Giant breeds – weight at 16 weeks x 2 = adult weight

A pup will be between 2/3 – 3/4 of its adult weight at around 6 months of age.

Here is a chart that can help predict a yorkie puppies adult weight.  This is only a