(no idea whatsoever of whether this has been done or not, let me know)
I present to you VEGETARIAN RANG
We've seen him eating meat on the show, and he is a fox so it kinda doesn't make sense, BUT HEAR ME OUT.
Yeon abandons Rang on the mountain and Shin Joo leaves too, to search for Yeon. Our poor little fox is all alone, with no one to take care of him. He is a kid, who is dependent on others; his brother and his brother's friend. Now that they are gone he has no one to turn to for help. But, we've seen how close to nature Rang was. We've seen his love for his dog and all living creatures (no humans included, of course). Also, we must remember that nature doesn't forget, she avenges herself when it's needed and takes care of those who treat her with respect.
The animals of the mountain remembered how Rang treated them, how he protected them and played with them as a child. That's why, when Yeon is gone, all of them start to protect him back. They sleep around him, to keep him warm, when it is too cold outside. They show him what herbs and fruits he can eat so he doesn't starve to death.
They become even more protective of him after the fire that took his precious dog away from them. Rang helped them get away from the flames and they want to pay him back in some way. Wherever Rang goes, they follow. They play with him and console him whenever he is sad.
Rang grows up eating all kinds of fruits, herbs, flowers and vegetables. Gone are the days when he used to eat meat too. He hasn't learnt to eat it, but also, he can't bring himself to even consider ever eating it. He would feel like a cannibal, of he ever ate any kind of meat again. All these different animals raised him, they may have been different from the ones that are usually on most families table, but they are still animals. They are his family; they cared for him when no one else would, they protected him, they fed him and played with him.
So no, Rang doesn't eat meat. He grows up to be vegetarian and respectful of every animal he meets. They are all his family, after all
