Cujo

Cujo is a small ghostly dog that appears in the episode "Shades of Gray." Though seemingly harmless, he can change from a cute little puppy into an enormous, rabid dog monster.

## Biography

At some point before becoming a ghost, Cujo was a security dog at Axion Labs. It is unknown what happened in between the lab changing the security system and his first interaction with Danny.

## Appearances

### Debut

Danny Phantom

Cujo is the ghost of a guard dog for Axion Industries. He came back to the human world in order to reclaim a squeaky toy he had left in the dog kennels.

Cujo first appeared at Danny's school and, after transforming, ran off to Axion Industries, with Danny in hot pursuit. Danny's attempts to restrain him only led to the lab being destroyed (resulting in Valerie's father losing his job).

Danny attempted to throw Cujo back into the Ghost Zone, only for the dog to escape again. He then began trying to tame Cujo, but the pair was attacked by Valerie, outfitted with her new ghost hunting equipment. Danny finally managed to locate the ghost dog's squeaky toy and Cujo happily gained liberation.

### Life Lessons (Cameo)

Though he didn't appear in person. Cujo was pictured on Valerie's most wanted ghosts poster. His picture looked more like that of a regular dog.

### Reign Storm (Cameo)

He later has a small appearance in "Reign Storm," as one of the many ghosts who escaped the Ghost Zone. Despite their previous bonding, he's seen briefly attacking Danny with the other ghosts. This could be a mistake on the writers' part that Cujo simply just didn't recognize him, mistook him for an enemy, or was merely angry that he never visited him. He was not seen with the other major ghosts later on, and it's unknown where he went.

Another interpretation could be that Cujo was furious at Danny being attacked and transformed in an attempt to come to his aid.

### Kindred Spirits

His last appearance was in "Kindred Spirits" in a flashback where Danny, Tucker, and Sam, were trying to get him back into the Ghost Zone.

In that episode he was happy and cheerful as always and tried to lick Danny, Tucker, and Sam, but Danny turned intangible so only his friends were licked.

## Personality

ujo is just a dog and does what dogs do: bark and play. However, since he's a ghost dog, his aggressive anger can be unlimited and very ferocious if he's provoked in any way. When angered enough he's been known to attack even his friends/allies.

Cujo is always happy but also very cautious when he wants to be. He had a strong sixth sense and can tell whether a ghost is strong or not.

## Appearance

Cujo is a ghost dog with red eyes, a purple tongue, green fur, and black ears. He wears a spiked black collar with a silver Axion Labs tag. He can transform in size from a small puppy to a giant, monster-like dog.

## Trivia

* Cujo also appeared in *Nicktoons: Globs of Doom* as the boss for Amity Park, being controlled and infected by the Morphoids-like blob.
* In the game *Nicktoons: Globs of Doom*, Danny called Cujo "Ghost Dog."
* Danny's choice of calling the ghost dog "Cujo" is a homage to the deadly dog from the movie *Cujo*, made famous by Stephen King.

* Cujo seems to be wearing an Axion Industries dog tag, a possible indication that he was one of Axion Industries' guard dogs and was drawn there to look for his chew toy in the area. This has lead to fan theories that he may have been put down.
* Unlike other ghosts in the series who typically oppose Danny, Cujo adores him. In all of his appearances however, his playfulness or ferocity made things difficult for Danny and his friends.
* Cujo is one of the very few ghosts who does not make a cameo in "Phantom Planet" turning Earth intangible.