[sganow]

I would be concerned with the food spoiling. As for taking in too many calories, you would have to be the judge of that based on whether he is maintaining good weight or gaining weight. If he's gaining weight, then you would want to cut back his portions. I free feed all my dogs, and always have, but they are used to it and do just fine. Not all dogs do well free feeding though. Most people discourage free feeding. You might be better off feeding 3 smaller meals per day. Or, if you're going to leave food down all day, only leave down the correct amount for his daily total recommended feeding amount. That way you can still regulate his intake.