Automatically assign model instance to the user who created it. And only that user can edit/delete the instance.

Let's say I have a model called 'Dogs'.  Users can create instances of Dogs.  Let's say we have a user called User1.  I have 2 questions:

1. When User1 creates an instance of Dogs, how do I automatically assign that instance to User1?  I tried using a model field like this but it doesn't pick the user automatically:

user = models.ForeignKey(User, unique=False)

2. After the instance has been created, how do I make the instance only editable and removable by the user who made it?  Basically, if User1 creates an instance of Dogs, only User1 can edit and delete that instance. 

Thanks.

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