Where do you give a piglet an antibiotic shot?

You don't unless you are a vet treating the animal because it is sick. If you were a vet you would know how to administer the shot.

Administration of antibiotics by unqualified people to animals that do not need treatment means that antibiotics will become ineffective in the treatment of diseases. So don't do it.

(you can do it no matter what just ask your vet where i give him a shot in the neck.) swinekid