Chuck Jones was a genius.  I have been sitting around for the past hour watching various shorts from the "Looney Tunes Golden Collection, Vol. 2" -- the collection which includes both "One Froggy Evening" and "What's Opera, Doc?" ("Rabbit of Seville" is on the first collection, I believe.)

At any rate, at the beginning of a lesser known short called "The Hep Cat," the hero (a lovesick tom) runs past the doghouse of his nemesis, which has the name "Rosebud" painted above the door.

I wondered, what sort of a dog would be named Rosebud? And the answer came to me...

A sled dog, of course.