Where is Grandpa Niu's dialect?

Grandpa Niu is a character in the domestic cartoon Tu Tu with Big Ears. Although he was kind-hearted, he was always afraid of Tu Tu. Because of his appearance and whether he had a beard or not, he finally became good friends with Tu Tu.

Grandpa Niu in Tu Tu with Big Ears is from Shandong. He has dark skin and likes children. His wife died and he had no children. He is full of stubble and fierce, but he is an extremely kind grandfather, especially fond of children, especially Tu Tu, who always tears. Niu Wangmo is the most feared person in Tu Tu, and Tu Tu thinks he is fierce. Later, he shaved Tu Tu's beard and loved Tu Tu as much as his grandson.