Help with my mexican orphan!?

So my friend went to an orphanage and adopted a little mexican and uses him for chores so I thought, you know i should to the same! So I did. I picked up a little 9 year old beef sitck and he's been doing some of my chores like mow my lawn, clean my house, and make me sammiches since my ***** left me. But I'm having some problems too!! He won't sleep on his mat in the corner! It cost me $19.99 at PetSmart! I even got the one with fluffy padding! AND THE SELFISH BRAT WON"T USE IT!!! He also won't potty train! I've tried all the techniques like shoving his face in his mess or punting him out for a day. So I'm thinking about just having him put down. I don't really know.