You are dealing with puppy hair matting and it can be a challenge. With Reno I just had to be persistent and patient with daily comb-outs. When you do comb out the mat, you will lose a little hair. I was able to cut away at some by holding my scissors open and almost slicing through the mat vertically - he didn't lose too many hairs this way.
It does get better, so don't get discouraged
