I think it's absolutely disgraceful using a shock collar on any dog, let alone a small puppy like that.
If you can't think of any other method to train your dogs other than by cruelty, i.e. by inflicting pain, you shouldn't have them.
Get yourself on a training course or at least, read a book on animal training and welfare.
If you lived in the UK, you'd be reported to the RSPCA.