Doggy Doors

So, to make dog doors that actually work, you need:
1 trapdoor
a wall with a 1 block hole

The One Block Hole

Place the trapdoor in the hole. The dog is one block high, and the trapdoor takes up a half-block of space, so the dog can't get in.

Here's Where I Moved

So... As I said earlier, I was going to move. Here's my place:

Yeah... So you get it... my house is HUGE and stuff... Doggy doors... et cetra, et cetra. Yeah...

Anyways, i had two wolves. Then, when I was looking for something (i forgot), The wolves multiplied. AUGH HUGE GLITCH!!! Then the wolves all DISAPPEARED!!!

So... I moved again. A nicer place: 

So... This world is kinda messed up... :(

I'm starting over.