Unknown necklace

I have a cat, his name is Mucho. Nice name, isn't it? hahh
My sister made a necklace for him. And there are two two colors of small balls, red and green. And seriously, I cannot see it. Because of his fats, the colorful necklace is buried under his neck. Someone please help me to make Mucho slim and healthy? I do not give that much for his breakfast and dinner. I even do not give lunch. I give only a little amount and he got fat. Very mysterious. hahh
Lastly, his belly is about to swipe the floor. Actually, I do not wait for that to happen, but there are something like this that cannot be excused not to happen.
Gosh.... I will try my best not to give too much, even though I do not give that much haha.