What is the name of the 46th president's dog?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q11696', 'id': 0, 'label': 'President of the United States'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q144', 'id': 1, 'label': 'dog'}, {'type': 'INTERNAL', 'name_': 'Q2850068', 'id': 2, 'label': 'United States presidential pet'}, {'type': 'INTERNAL', 'name_': 'Q38280', 'id': 3, 'label': 'German Shepherd'}, {'type': 'INTERNAL', 'name_': 'Q862444', 'id': 4, 'label': 'first family of the United States'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q104817501', 'id': 5, 'label': 'Major'}], 'links': [{'name_': 'P279', 'source': 3, 'target': 1, 'label': 'subclass of'}, {'name_': 'P527', 'source': 4, 'target': 0, 'label': 'has part(s)'}, {'name_': 'P527', 'source': 4, 'target': 2, 'label': 'has part(s)'}, {'name_': 'P31', 'source': 5, 'target': 2, 'label': 'instance of'}, {'name_': 'P4743', 'source': 5, 'target': 3, 'label': 'animal breed'}]}