I swear I have seen another cartoon in which the character "Nibbles" was "introduced" yet the opening scenes in here make it sound like he's introduced in THIS cartoon. I finally looked it up and found out THIS cartoon was the first and the other one - "The Little Orphan" - was the similar story, and released in 1948.
Anyway, Jerry wakes up from a bad dream and hears a knock on the door and there, under a blanket in a little wooden bowl is the little gray mouse. Attached to the blanket is a note saying, "Please take care of Nibbles. He's always hungry. P.S. Feed him lots of milk."
Well, as a watched this I realized it's a different story because in the other cartoon, the "orphan Nibbles" eats Jerry out of house and home. Here, he's just a milk freak, so the story centers around the little one getting his milk from Tom's bowl.
The gags are funny in here, I am to give them that. I also have to remark how violent some of these T&J cartoons are, not that it bothers me but often I am almost shocked at the amount of it....mainly because I can't believe the pain that usually inflicted on the poor cat (Tom). It's unbelievable what this cat goes through in most of these cartoons, but this one isn't as rough. At least both mice get a little of their own medicine, too.