Maybe because the water feeder bearing isn't that good, I don't know. 1 1/2 day, the amount of water drinken only 50ml. 

Yea, lamb based kibbles are better than chicken based. That's what I was told and what everyone seems to know but scientifically, I do not know the reason why. Possibly because chicken are sometimes injected with hormones?

Yes, I do give my dog homecooked food sometimes. I will cook them simple dishes. Minced meat + egg and minimal oil, just cook like that and pour it on top of the kibbles and let them eat. But it's seldom I do that because I believe kibbles are more balanced diet for dogs.

Yes, d*** Van Patten's Natural Balance. It's hard to find this brand, so far I've only seen it at Seapark Pet Supplies in SS2. It is indeed a very good brand of dog food and my furkids had finished at 7kg and 15kg. Now, I am changing to Blackwood 3000 (Lamb) for a change of taste.
Sorry when I started this topic, I didnt know about Royal Canine. One reason its not in the list is that it is TOO EXPENSIVE. Possibly the most expensive dog food in the market.

Pets Wonderland doesn't stock California Natural. Only certain petshops that bring in holistic dogfood. Canidae and Acana are good too. Since your dog is sensitive, better not try Orijen.

Not all dogs can tolerate high protein dogfood. Some dogs got very sensitive skin and bodies, taking Orijen could cause more harm than good.

I use Orijen but only on 1 dog, the others on California Natural.