Mr. Carrot

Mr. Carrot is the name of Bolt's favorite chew toy.

Lore
This 'character' is first seen at the Animal Rescue Center in the beginning of the movie. It is presumed that Bolt was given the toy to play with while he was taken care of at the center, and he quickly grew attached to it.

Mr. Carrot does not develop much in the movie and shows no particular characteristics, partly because his role in the movie was not as central as many of the other characters, partly because he is a squeaky toy.

Mr. Carrot is Bolt’s favorite toy and has been from early puppyhood, making him one of the hero’s more intimate childhood friends. Mr. Carrot also holds a distinguished emotional value for Bolt reminding him of times he has shared with Penny. Bolt is still seen playing with Mr. Carrot after settling down in Penny's house after his great adventure.