[crazywiggy]

I would definately recommend training the dog how to behave around piggies. Teach her an appropriate behaviour, such as lying down watching you, when she is near the piggy cage. Use lots of rewards.

Let me make this perfectly clear SHOCK COLLARS ARE NOT TRAINING!!!!
Shock collars cause shock, pain and fear. They are abusive and unnecessary.

Even if you are happy to use violence to train your pet please consider this. Using a shock collar (or pain in any form) is EXTREMELY likely to CAUSE aggression.

Dog goes towars piggies and gets shocked. Dog learns that piggies = intense pain. Dog becomes fear aggressive towards piggies. Dog is MORE likely to attack and kill piggies. Please do not risk your dog and your pigs by reverting to abuse.