Naughty Dog

Naughty Dog is a character used as the logo of the game company (Naughty Dog which the dog is named after), he doesn't appear in any of the games other than that.

Quotes

 * "Woof-Woof!"

Crash Bandicoot
 Cut Animated Intro 

ND was an ordinary dog in Australia owned by an alcoholic until Cortex accidently took him with the wild animals he was rounding up, he was then mutated with Cortex's machines.

 Boss 2: Ripper Roo 

Cortex was going to have The Naughty Dog go after Crash but remembered that the dog was basically useless to him, the dog spent the rest of its time lazing around the castle.

 Level 21: Slippery Climb 

Cortex knowing that Naughty Dog was on the ground floor made sure that he locked the Front Door so that Crash couldn't just easily get in, Crash instead decided to scale the walls.

 Boss 5: Dr. Nitrus Brio 

When Cortex Castle began burning down Naughty Dog was on the ground floor so he simply picked up his drinks and walked out casually to look for a place to lay down and finish his drink.

 End Credits 

Luckily for him Brio later turned Cortex Castle into a Bar so Naughty Dog returned and became his regular customer.