Always apply the scale of your model (ctrl-A) before creating the hair systems and styling them, don’t apply it after or this happens:
And be careful which settings you change in the children panel. I was scratching my head for days trying to figure out what was causing those bald lines.
It was because the “uniform” setting was at .1:no:
I hope that saves you some time and hair (from scratching your head :D) and will help your future furry projects!.