The hamster and the pollar bear

The daughter asks her mother:
-My dear mother,please buy for me a hamster!
-My daughter you will get tired of it,what will you do with it then?It isn't a toy,you can't throw it away!
-Then we will buy a cat!The cat will eat a hamster and it will live with us.
-And when you get tired of the cat?What will you do then?
-we'll buy a dog!The dog will eat the cat and it will live with us!
-And when you get tired of the dog what will you do then?!
The daughter is shocked.She wasn't waiting for this question.In a few minutes:
- AND WE WILL BUY THE POLLAR BEAR!