-The Dog ("Parallel Universe")
The Dog is an alternate version of Cat, from the female-orientated parallel universe.
Presumably, the Dog is a descendant of a dog that Deb Lister brought onto her Red Dwarf, prior to the Cadmium II incident. As this universe is similar to the Dwarfer's universe, it is assumed that he is the last of his kind. Following the appearance of another Red Dwarf, the Dog encountered his counterpart, Cat, which he believed to be a "funny-looking dog." The Dog was excited to meet the Cat and wanted to smell his behind, much to the Cat's horror. The two shared some time in the ship's disco. The Dog enjoyed himself, completely oblivious to Cat's distaste for him.
The Dog displays many personality traits of his canine ancestors. He is dim-witted, excitable, and has terrible hygiene. He seems to suffer from separation anxiety as he panics when the others have left him by himself. The very mention of the word "bath" upsets him to the point of asking for the word to be spelt out. Like dogs, when he first meets Cat, he offers to let him smell his "behind", and he is infested with fleas. He has what sounds like an American "redneck" accent. He enjoys dancing, which for him consists of just stamping up and down and howling.
- "I'm gonna smell your behind, and then you can smell mine! Now is that a Deal?" (RD: Parallel Universe)