Catz and Dogz

Can I not do what you required? Why can't I? Am i incapable of doing just such a simple thing such as shutting up?

Ever wondered why dogs and cats fight? Well, long time ago both were best of buddies. The cat would bring the fish on the table to share the food whilst the dog would protect the cat from any harm. Both lived in harmony, till one faithful day...

Dog faces a outrage.
Dog tells cat.
Cat nods and seemingly understand.
Dog is disappointed at cat's response and snaps at cat.
Cat gets angry and ignores dog.

And that's how cats and dogs are enemies thereafter...

We're not cats and dogs are we?