However, their size can vary depending on the breed and individual rat. Some breeds, like the Dumbo rat, tend to be slightly smaller than others, while large breeds like the Standard can reach the upper end of the size range.
It's also important to note that males tend to be slightly larger than females.
Here's a breakdown of average sizes for some common pet rat breeds:
* Standard: 7-10 inches
* Dumbo: 6-8 inches
* Rex: 6-9 inches
* Hairless: 6-9 inches
* Fuzzy: 6-9 inches
Ultimately, the size of your pet rat will depend on its genetics and diet. With proper care, they can live for 2-3 years, so you'll have plenty of time to bond with your furry friend.