Linus is the name of one of the Black Fang members from Fire Emblem 7 (GBA). His brother, Lloyd, is also a Black Fang member as well as his parents Sonia and Bernard. They are the antagonists in the game although the depth of the storyline will sometimes show his reluctance to follow the Dark Lord Nergal. The main reason that Linus and Lloyd still fight for an evil cause is because of the family ties in the evil gang. After killing Lloyd in one chapter, Linus says in a further chapter nothing about committing the crimes, but it solely focused on revenge for his dead brother, showing the strong connection between the two. The tragic nature of this storyline grasps many Fire Emblem fans and, when the game was first released, many thought that it was possible to unlock the two brothers as playable characters. Unfortunately, this was not the case.
I don't think you should have named it Linus for this reason, and for that fact that a chihuahua does not fit the bulky characteristics of Linus from FE7.