Just curious really,  I have three males, the two younger boys are enormous (for GPigs!) but the third, who is actually the dad of one of the other boys is really quite tiny.  Not skinny at all, but much smaller with a more pointy face.

Do GPigs come in different sizes?

C.

My family have had many guinea pigs over a number of years (around 15 I think) and they come in all shapes and sizes.
At the moment we have 3 girls and 2 boys, 2 of the girls are huge and much bigger than the boys.

They SHOULD all be the same size (and same type -faces should be short, broad and blunt with fully flopped ears, large round eyes etc) but like with all animals when not bred with the breed standard as the goal they can end up looking any way, and that includes size differences. Also inbred animals tend to be smaller than outrcrossed ones.