i am no expert yorkie trainer however what worked for me was...keeping some of their urine on the pad at all times. They have that simple solution spray that attracts them to the pad but I find putting the urine from the old pad to the new one works very well.
my yorkie just turned 12 weeks old and i would say he is 95% potty trained, still a chewer but potty trained.
also, giving them a treat after they use the pad works wonders also. i use nutrical as a treat b/c he loves it so much. giving them a 'real' treat and he's put on too much weight. you could also use a piece of kibble as a treat.
using nature's miracle works wonders at cleaning up the odor of old urine on carpet.
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