Find an old cartoon

I've watched a cartoon before and I've forgotten the name. Can someone tell me the name?
The plot was as follows:
There was a little boy whose family was very poor, but he liked drawing very much and was very good at it. He only had a grandfather and a dog who depended on each other for survival. Later, his grandfather passed away.
The little boy worked in a rich family. His family had a daughter who had a good relationship with the little boy. Later, the rich family lost money, and the little boy was accused of stealing it. The puppy helped to find it. The puppy and the little boy later froze to death.
The little girl did not get married and went to the church to become a nun.
That's about it

Answer 1

If you wanted to find an old animated film, you could go back to some classic animated films such as Journey to the West, Investiture of the Gods, Strange Tales from a Chinese Studio, and so on. These works were all myths and legends of ancient China. They had rich imagination and profound cultural implications, which were very suitable for animation materials.

If you wanted to watch modern animated films, you could also watch some of the well-received works such as Your Name, Attack of the Giants, Blade of the Destroyer, and so on. These works all had unique styles and stories that were worth seeing.