When I trained my puppy (small one lik that one)... we got a little bell (like a service counter bell)... and everytime we took it out... we would physically take it's paw and slap the bell... then take it outside.
If it peed on the floor... we would still take it's paw and hit the bell... then take it outside.
This is only good till it finally figures it out... and a little after that. Then it'll start dinging the bell for no reason... //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif. But it works great for a while.
nG