def flatten(nested, column_names):
    all_dicts = []
    final_result = {}
    index = 0

    def recurse(data):
        for k, v in data.items():
            final_result = {}
            if isinstance(v, dict):
                if any(isinstance(i,dict) for i in v.values()):
                    recurse(v)
                else:
                    final_result.update(v)
                    all_dicts.append(final_result.copy())
            else:
                final_result[k]=v
                all_dicts.append(final_result.copy())

    recurse(nested)
    return all_dicts



def flatten2(nested, column_names):
    all_dicts = []
    final_result = {}
    index = 0

    def recurse(data, existing = []):
        for k, v in data.items():
            final_result = {}
            if isinstance(v, dict):
                if any(isinstance(i,dict) for i in v.values()):
                    existing.append(k)
                    recurse(v, existing=existing)
                else:
                    final_result.update(v)
                    final_result.update(zip(column_names[:len(existing)], existing))
                    all_dicts.append(final_result.copy())
            else:
                final_result[k]=v
                final_result.update(zip(column_names[:len(existing)], existing))
                all_dicts.append(final_result.copy())

    recurse(nested)
    return all_dicts


a = {
    'foo': {
        'cat': {'name': 'Hodor',  'age': 7},
        'dog': {'name': 'Mordor', 'age': 5},
    },
    'bar': {
        'rat': {'name': 'Izidor', 'age': 3},
        'ratv': {'nameb': 'Izidor', 'age': 3},
    },
    'baz': 'woops',
}
print(flatten(a, ['foobar', 'animal']))