Gently stroke their back, from their head to their tail.

I'll carry it with both hands so I don't drop it.
When lowering the guinea pig, support it with your hands until its feet touch the floor.

✖ If you put your finger in front of its mouth, it might mistake it for food and bite you.
✖If you do that, the guinea pig will get an upset stomach.
✖ If you raise a guinea pig's fur, it will get ticklish.