Retro joke?

A few years ago, a major cereal brand that had always used a rabbit to represent its product, decided to make a change. They changed some of the processed sugars to fruit sugars and began changing the various colors to fruit shapes.

They were ready to test their new product on the market, and they decided to make a change in the animal they had used in their advertising for years. They chose to go with Astro, the dog from the Jetsons.

Sadly, however, they found that the product didn't test well in the market place, proving once more that

You can't teach an old dog new Trix.