Max's Lobster is a toy Max got for his birthday from Aunt Clare and Uncle Nate in Max's Birthday.
The lobster is shown to have a mind of its own as it walks without anyone winding it up. A running gag is that the lobster is shown to be mischievous and always causes trouble for Max and Ruby by either chasing Max at the most inappropriate moments. For example, in "Max's Hand Print" it chases Max every time Ruby tries to get his handprint, causing Max to accidentally get a print of his foot, ears, and tail instead of his hand. It also likes to steal a key item Ruby needs to complete her goal. For example, in Ruby's Jigsaw Puzzle it steals the last piece of the puzzle Ruby is trying to put together.