How funny, this is something my OH were just talking about.
Fletcher is 18 months old and often leaves meals. I used to worry but he's incredibly healthy, and his weight is consistent so I think he's just not greedy and just eats what he needs/wants (wish I could learn that trick!). Also, every now and again, he will ask for more dinner which I always give him as I know it's not him being greedy, he's actually hungry
I've always believed that food should be given to a dog at a certain time and not left for them to graze throughout the day but Fletcher is so laid back, I don't need to be his 'alpha female/food provider' so I just leave it. He sometimes eats his breakfast at 4pm because he left it all day, and then his tea at 6pm!
BUT we are due to get another Doodle puppy on Tuesday so I will be interested to see what difference it makes!