This has nothing to do with animal law - moving to general practice.

Moving to debt collection. Demand an accounting which documents the alleged non-payment.

CA has a puppy lemon law. Review it and proceed accordingly.

His defense attorney will deal with these issues. You have no standing in the matter.

You need the vets' documentation of the puppy's condition as a basis for a lawsuit. I hope the breeder is also in your state.

This is not an animal law question - moving to lawsuits and disputes. It is not "ok;" it is trespass and nuisance. Proceed accordingly.

Evict her. If she becomes abusive, consider obtaining a temporary restraining order.

Stop broadcasting your friend's situation on an open forum. You have no standing, and are intermeddling in a matter for which your friend has counsel.

Moving to debt collection. This is your sister's issue; not yours. The police are NOT going to come to her house. She should call the AG's...

The client could and should have refused to sign w/o reading.