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My 12-week-old puppy is 3.8 lbs. How big will he get as an adult?

Updated On September 23rd, 2025

Pet's info: Dog | Yorkshire Terrier | Male | unneutered | 3 months and 16 days old | 10 lbs

I was just wondering how big Zeus might get to be as an adult. At 12 weeks he was 3.8 pounds. I see different things online about doubling his weight and such. thank you for any help.

1 Answer

Most Helpful Answer

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Answered By Makenzie Kurth, DVM

Veterinarian

Published on August 25th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach. I do the trick of doubling the weight at 4 months but, like all guesstimates- it’s not perfect. Zeus will probably be about 8 lbs- give or take a pound- when all is said and done. Best wishes to you and you little guy!

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