Why did the big fat pink hog changed colour?

There is this big fat pink mean hog. He is terribly fat, about 400 pounds. He is mean. He is old. He eats pasta all the day long, splashing it around. He drinks beer. He shrieks "f... off", "f... off", "f... off". He used to be pink all over. Of course, when he because mad, which was often, his snout became all red, and he clicked his big tusks. Then, one day, suddenly, he became completely red! Now his snout is read, and his neck is red, and his chest is red, and everything about him is read (and his eyes are little and red, too). Why did he change his colour like this, what for?