Things like this happen so routinely that I think I'm the one mentally unbalanced and should be looking for help.

This girl is exhibiting psychopathic behavior. By her actions she is a danger to others. This includes pets and chances are towards people. She is at the age when major psychiatric problems manifest. Pray she gets the help she needs as well as prosecuted for harming that senior dog.

Serious disconnect with "normal" here. Something is terribly wrong with this lack of feelings for a fellow creature and your own "family member" at that. Please ensure that she cannot have access to anything else living.

How true kbug, She is in serious need of some mental health evaluation. So sad!

This is really sad...seem like all i see is people hurting animals...this dog did nothing to you and you should be ashamed of yourself. she needs to be put behind bars, next time this could be a human!