Yes trim the poop area.
I would suggest getting a 'doggie litter box' - SEE LINK BELOW
I place the wee wee pad inside the box, it forces them to have to go into the box to use the pad, and no more misses
Here is the liter box (Petco or Petsmart) – I Have the Miniature Size (6 to 15lbs dog) one – Wee Wee Pads fit the Best in this size.
http://www.petsmart.com/global/produ...N=2033166&Ne=2