The missing verse is the following:

But in spite of ev'rything they tried.
Poor Senor Don Gato up and died.
O it wasn't very merry, Meow, Meow Meow.
Going to the cemetery, Meow, Meow Meow.
For the ending of Don Gato

For some reason, the messages posted to this thread are out of order on the earlier portion of the page. All six verses of the standard English-language version can be found on a post from 9/15/98.