Potty Training /Anal glands

Question
I just got a 4 month old silky-poo.  My friend told me that I need to regularly express the anal glands so it doesn't get impacted.  A lot of people I have asked have never heard of this.  Also potty training is going great for the peeing, but he never poops on the piddle pad.  I have tried to rub a little of his poop on the pad so he gets the idea.  I always praise him and usually give him about a third of a t-bonz when he goes on the pad.  

Answer
I would leave the anal glands alone as long he doesn't seem to have problems.  The scooting is a sign of problems.  Sometime licking or scratching is a sign too.  

If you are feeding him on a regular schedule, he should develop a regular bowel movement schedule.  Watch for the sniffing and running in small circles.  Take him to to pad and then praise him and treat him like you said.  I think at that age, they have much less warning than a full bladder gives them.