A dog?

For the last few months Josh has really been hounding us to get a dog. I guess one of his friends at school has a dog that just had puppies and she told him that she was going to give him a puppy for his birthday. Well we told him that people don't just give Lab puppies away but he kept insisting that she was going to give him a puppy. So last night he spent 20 min on the phone to his friend, after he hung up he came to me and said "momma I need to borrow $400 dollars to get the puppy. You can pay with cash or a check." Of course I told him that I didn't have $400 to spend on a dog. "I'll pay you back" he said. I told him that I still didn't have $400 for a dog. He was crushed, all night he mopped around and cried. Just before bed I caught him coming out of my room with a hand full of Halloween candy. I asked him what he had, he showed me and said "I got it so I could calm down". Anyway I guess the question now is should we get a dog?