Fanon:Barney Gallagher

Barney Gallagher is a Golden Retriever who lives in the quiet town of Willow Creek. He is originally the dog of Karissa Gallagher and he is described as being faithful to her, especially when it comes to growing up. After Karissa gets kicked out of her home and she refuses to return, Barney's care is handed over to Karissa's mother, Maggie. Maggie cares for Barney in his final years of life.

The Sims 4
Barney is adopted by Lawrence and Maggie Gallagher. They adopt him for the purpose of hoping that their daughter, Karissa won't be as eager to grow up. Karissa raises and takes care of Barney, but the topic of her growing up didn't fade away. In fact, Barney is implied to be faithful to Karissa by siding with her when it comes to the topic.

When Karissa is deep into her teen years, Barney is the first of the family to meet her boyfriend, Jared Parker. He is impartial to Jared when they meet. He eventually reunites with Karissa's brother, Dennis when he comes to visit for an anniversary party. After Karissa is kicked out of her home by Lawrence, Barney is taken care by him and Maggie. However, when Maggie divorces Lawrence and kicks him out, Barney is taken care by her as a request from Karissa.