It also can be a sign that you're not brushing enough
. Almost like flossing w/ us...if you don't floss often, you will have bleeding gums when you do.
Yorkies are prone to teeth problems unfortunately. This was one of many reasons I chose to feed raw...no brushing needed b/c Snick's teeth are sparkling. I still brush em once a week but prob should more often.
What type of brush are you using? Most pet supply stores sell way to large brushes for our lil guys. The brush that works best for us is an infant brush..perfect size and no harm bristles. Gauze is also good, but not as effective.
Good luck
Snick & Viv