He looks like he is at an ideal weight. You shouldn't be able to see his rib bones but you should be able to feel them beneath his skin. He should have definition in his "waist". If you can see his ribs you should probably feed him a little more...but please do not over feed him....he is very cute and I wouldn't want him to have any health problems.
Thanks Guys, seem so many agreed he in ideal weight, i will not feed him extra food to put on some weight.
I am very concern about his hair lose now, he armpits just 'BALD"! I am worried that he not growing any hair at that area anymore... BTW, it is Chi skin look BLACK when there is no hair? Miky's armpits' skin is black.
About the feeding, at this moment, i feed him 100g per meal, twice aday. I think it is the ideal amount for small breed.