Often, dog cartoons with teeth show them in a way that emphasizes the dog's personality. Maybe the teeth are shown prominently when the dog is barking or growling to add intensity. Also, the style of the teeth drawing can vary, from realistic to more cartoonish, depending on the overall tone of the cartoon.
A 'bakugou dog teeth fanfic' could potentially revolve around Bakugou having some sort of special power or quirk related to dog teeth. Maybe in the story, his dog - like teeth give him an edge in combat or some other aspect of the fictional world. It could also be part of a more humorous or endearing aspect of his character within the fan - made narrative.
She might be lonely and the dog is her only company. Telling a story is a way for her to feel like she's communicating with someone, even if it's a dog.
To comfort the dog. Maybe the dog is scared or sad, and the story can distract it. For instance, if there was a thunderstorm outside, the owner might tell a story about a brave dog that wasn't afraid of anything, hoping the dog would feel better. Also, it could be a way for the owner to bond with the dog. By sharing stories, they create a special connection between them.
You could try looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfics, and there's a good chance you might find the 'bakugou dog teeth fanfic' there if it exists.