Call the pound?

We all live together, there is this guy he brought home a German Shepard without asking the family. When we saw the dog we said no, he has not trained the animal or anything.

The dog jumped on top of my kid scratched his cheek should I call a place to pick up the animal.

The owner is aggressive and will not like this do I have a right to do this call the pound?

The dog also jumped & knocked down my elderly mother

The animal continues to jump scratch with no efforts to train the animal.