Can I have a Pony?

Lillie - Daddy, can I have a pony?
Dad - Where would you keep it?
Lillie - In my room.
Dad - Your room isn't big enough for a pony.
Lillie - It is, if we get a little one.
Dad - Sorry, you can't keep a pony in your room.
Lillie - Then can I have a cow? We can keep it in the backyard.
Dad - No, you can't have a cow.
Lillie - But we can get milk from it!