Charles is the Loud family's pet dog. He was adopted into the family when Lana found him and cried until they agreed to keep him.[1] Although he generally does not play a large role, Charles makes frequent cameo appearances throughout the series. Because he seems to hang in Lincoln's room, and around Lincoln most of the time, it is possible he is mostly Lincoln's dog.
Appearance
Charles is a Pitbull Terrier Puppy with small ears, a small nose, and a black spot over his left eye.
Charles is named after Peanuts creator Charles M. Schulz, while he is modeled after the two dogs featured in Cliff Sterrett's comic strip Dot and Dash.
Of all the Loud family pets, he is the one who has hung out with any of the Loud kids the most.
He is the only Loud pet so far to play an important part in a story, as he tries to make Lincoln confess in "Butterfly Effect".
The Loud House Encyclopedia