Here's a breakdown:
* Average size: Most adult guinea pigs range from 7-11 inches in length and weigh 1.5-2.5 pounds.
* Smaller breeds: Guinea pigs like the Abyssinian, Peruvian, and Teddy typically fall on the smaller end of the spectrum.
* Larger breeds: Breeds like the American, English, and Sheltie tend to be larger, sometimes reaching up to 3 pounds.
It's important to note that even within the same breed, individual guinea pigs can have different sizes. Their size can also be influenced by their diet and lifestyle.