I am still a bit confused about the relation of Proxy models to their Superclasses in django. My question now is how do I get a instance of a Proxy model from an already retrieved instance of the Superclass?

So, lets say I have:

```
class Animal(models.Model):
   type = models.CharField(max_length=20)
   name = models.CharField(max_length=40)

class Dog(Animal):  
   class Meta:
       proxy = True

   def make_noise(self):  
       print "Woof Woof"  

Class Cat(Animal):  
   class Meta:
       proxy = True

   def make_noise(self):  
       print "Meow Meow"

animals = Animal.objects.all()
for animal in animals:
   if (animal.type == "cat"):
      animal_proxy = # make me a cat
   elif (animal.type == "dog"):
      animal_proxy = # make me a dog
   animal_proxy.make_noise()

```

OK. So.. What goes into "# make me a cat" that doesn't require a query back to the database such as:

```
animal_proxy = Cat.objects.get(id=animal.id)

```

Is there a simple way to create an instance of Cat from an instance of Animal that I know is a cat?