When she was 4, I promised my oldest daughter a poodle for her 12th birthday. I thought we would have a bigger house by then. We are in the same place, house-wise and money-wise. She did not get a poodle for her 12th birthday. Well, her 13th birthday came and went recently with no poodle (she got a copy of The Extraordinary Education of Mr Benedict). She didn't complain; she just continued to feed her beta fish.
But be careful what you promise....my husband keeps promises (even when he didn't make them) whenever possible. We called the poodle rescue on Sunday afternoon, struggled through 2 hours of traffic to go 40 miles, met the dog of her dreams and adopted Duke that evening. So far, he is a gem.