WOW! The kitty on the outside of the glass is unhappy! The dispaly of teeth ought to be enough but the pinned back ears and the position of the body and tail are clear indications that this kitty is angry and ready to pounce! That's not a situation I would want to have at my house! The Wundermutt would probably put up a good fight but if a fully grown male cat came down to pay a visit it would probably get ugly.
I can explain it to you but I can't understand it for you.
"Any man who thinks he can be happy and prosperous by letting the Government take care of him; better take a closer look at the American Indian." - Henry Ford
Corruptissima re publica plurimae leges; When the Republic is at its most corrupt the laws are most numerous. - Publius Cornelius Tacitus