Dear Annie: My grandson, “Billie” is 5 years old and still not potty trained. We have tried everything to get him to use the toilet -- rewards, bribes, “gentle threats,” etc. We suspect he has encopresis -- the repeated, involuntary passing of stool into the clothing. This can happen when im pacted stool collects in the colon and rectum, while the more liquid stool involuntarily leaks out around the impacted stool. ...read more read less