In the bridge of the theme song it declares, "Mr. Ed will never speak unless he has something to say."
Then in the last verse, it says, "This one will talk to till his voice is hoarse."
So which is it? Is Mr. Ed a conservative talker who only speaks when he feels he should (he once said he talked to Wilbur because Wilbur was the only person worth talking to) or will he talk until his voice is hoarse?
If you only speak when you have something to say, would you be talking until you were hoarse?
Either Mr. Ed has a lot to say, or he just has weak vocal chords!