Dogs

Petshop owner: If you buy a dog, you will get 1000 free things.
Customer: What?!
Petshop owner: Just buy one.
Customer: Get me a golder retriver.
Petshop owner: Okay, that will be $1200.
Customer: Now, i have bought a dog, what will i get?
Petshop Owner: Of course, as i had said, FLEAS!