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My two male guinea pigs are different sizes. Is this normal?

Updated On September 23rd, 2025

Pet's info: Other | Unknown - Other | Male | 7 months and 4 days old

We got 2 male/brother guinea pigs, now 7 months old. One seems to a lot smaller then the other (brown and black one in pic). Both seem healthy, eat well, run around like crazy. Should I be concerned?

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1 Answer

Most Helpful Answer

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Answered By Mariya Gugel, DVM

Veterinarian

Published on November 22nd, 2017

Congratulations on your new pets - Lenard and Sheldon are super cute (and those are great names!). From the picture, they both look to be about the same size, but you can weigh them to be sure. As long as they are both eating normally and defecating regularly, there is no reason to be concerned about their size difference. You can hold them on their backs and look at their genitals to make sure they are both boys, as females can be smaller than males. I hope this helps!

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