Why watching him? I supervise my dogs' meal times but certainly don't "watch" as in spend 40 minutes staring at them. Put his food down somewhere you can see him but he's out of the way - laundry, outside the kitchen window, something along those lines. IGNORE him. If he doesn't finish the food in 10 minutes, pick it up and put it away. So what if he goes two or three days without eating? a healthy young dog with no on going health issues is not going to starve himself to death. In fact dogs are designed to gorge and fast so a day or two without food isn't anything particularly abnormal. Is he getting plenty of exercise and mental stimulation? - nothing like it to stimulate appetite.
You can raw feed ANY breed - but you need to know a bit about it, there's several threads on here that will help. Canned food is a good way of feeding your dog flavoured water, not much use for anything except tempting a sick dog to eat IMO.
Hi,if I leave the food out there,he will ignore it and run away,several moths ago,he was 20-21kg.After I watch him to eat everyday,he is 25kg right now.That's the main reason,I want him to intake certain amount of food everyday,so it will put some weight on him,it works.
I used to walk with him after lunch about 30 mins everyday and also we got big backyard.What do you mean mental stimulation?He joined the puppy school when he was a puppy and he can do many things following orders.He is health as well.we go the the vet twice every year only for annual injection and heartworm injection. Only problem is his eating habit.