is the eating thing sometimes breed specific? I am on my second beagle mix, one beagle/hound, female, current one is a beagle/dachshund male. Neither one had/have any issue with leaving a bowl of food all day long. Moogie will walk by his bowl, sniff, and keep on walking to his bed. Other times he'll eat a few mouthfuls and then go back to sleep. Still other times, he'll eat most of the bowl, if not all, and if I re-fill it, he sniffs, and goes back to sleep.(notice the trend here?).
Used to have an pure bred female Akita (American), same thing; growing up, we always had shepherds, always left food and water in a bowl, all day long, and they ate when they were hungry.
However, step daughter has a box/dane mix that she had from puppy, would eat the floor under the bowl if he could. She can only feed him small cups at a time, and I am certain he eats it whole.