Just A Quick Question Really...

[S&J]

...at what age do guinea pigs reach adulthood and they're fully grown?

Thanks

 

[Taylor]

when they are fully grown adults they should be between 9-12 months. sometimes they stop growing earlier, or sometimes a year after. hope this helped

 

[S&J]

Thank you

 

[Jerrybelly]

Piggies can keep growing until around 12-15 months, I believe