Tux Dog is a highly intellectual character who the Problem Solverz go to for advice. Although usually unwilling to directly help the cause, he pretty much offers the whole solution. He lives on the fourteenth floor of an apartment building in Farboro. He is very wealthy. He is known to play tennis as shown in Videogamez. In K-999 and Da Little Explorerz, he left them a dog named K-999 to help them. A strange thing about him is that he has a cat that is shown in The Mayan Ice Cream Caper. His long time enemy is Bad Cat, who he got help from the Problem Solverz.
As can be expected, he wears a tuxedo. He also wears a top hat, and is seen to have a "snazzy" tennis sweatband in Videogamez.
Tux Dog doesn't really have a relationship with Alfe. Their relationship is neutral. They're both not enemies, but at the same time they're not best friends, Alfe also called him "Horace" in Alfe gets homeschooled.