* Breed: Some breeds, like the American, are larger than others, like the Abyssinian.
* Sex: Male guinea pigs are typically larger than females.
* Age: Guinea pigs gain weight as they age, reaching their full size around 6-8 months.
* Diet and Exercise: A healthy diet and regular exercise will help maintain a healthy weight.
On average, a healthy adult guinea pig weighs between 1.5 and 2.5 pounds.
However, it's important to note that this is just a general guideline. If you are concerned about your guinea pig's weight, it is best to consult with a veterinarian.