Originally Posted by EntropyControlSpecialist:
I'm sorry. 
That makes me anxious to think about being on edge the entire day trying to anticipate harmful behaviors before they occur.
I would issue a behavior plan. Three more issues and he's suspended for a day. After the suspension, should there be any other issues the contract will be terminated.
It's odd to me that Mom was adamant about him not being aggressive at home yet told you yesterday that they're trying to help him stop with the dog. 
The lying, and not actually sending a clear NO message from Dad at pick up, makes me think they're not really working on it. 
Don't think I'd continue on.
This was my conclusion as well.
I like the behavioral intervention plan idea. Noticeable improvement in X amount of time with NO incidents to continue care.