I am sure this is frustrating. I do have a couple questions before I answer your question. !) What have you tried so far? 2) Have you had him checked out by his pediatrician fro any complications?
YES HE HAS BEEN CHECKED BY HIS PEDIATRICIAN SEVERAL TIMES. HE HAS HAD IN THE PAST TROUBLE
HIS TOYS HAVE BEEN TAKEN AWAY. BUT IF HE CRIES ENOUGH THEY ARE RETURNED
Well, he is obviously somewhat getting the picture, as he is urinating there. It is not uncommon for a 4-year-old to not be fully potty trained. i am assuming he is not shaking and aweating when he defecates elsewhere. If he is, you might schedule another visit with the pediatrician. Otherwise, consistancy is imporotant, but do not force the issue. praise him for successess, but be understanding when he is not successful. There are some good books and videos out there that exemplify in a child's language good potty behavior. Try to be patient. With consistancy, you will likely have success.
Maybe instead of removing his toys you could just try a reward system of giving him something rewarding for successess. Once again, this will only work with consistancy.