Paedantic Basterd

Don't be an idiot. You understand the basics of evolution and genetics.

Did you know that hyenas share more of their genetic code in common with domestic cats than domestic dogs? And humans have 90% homologous DNA with cats compared to 81% shared with dogs. Again, the world is not as simple as you would like it to be.

EDIT: In case the retort was not obvious, there are closer interspecies comparisons you could make that are less obvious-seeming than that which you made. If you believe in evolution, then you have to accept that life exists on a spectrum. The way we arrive at these end-branches (e.g., cats and dogs) is when the common ancestors of both die out, leaving these seemingly dead-ends.