All 3 of my Yorkies have their butt hair trimmed short. They all have long hair on most of their body and when the poop would hit that long hair there it would get stuck and make a mess. I just trim them about once a month back there and things work great.
I do all my Yorkies grooming myself as with 3 of them grooming would get costly for sure. They all get cut differently though depending on the needs of the dog. My male puppy I keep his bangs trimmed so he can see. My daughter pulls up her female puppies bangs so she can see and my older Yorkie has long bangs, but his are not as thick as the puppies so he can still see. Other variations on trimmings with mine as needed, but all get their back ends trimmed regularly.
I would say it is a fairly common problem with Yorkies, at least with mine. I know the lady that I got my puppies from had already trimmed all of the puppies backsides before I picked mine up because of this happening.
Just keep it trimmed if you can.
__________________  It's raining Yorkies here! LOL Teek  ,Rowan  , Raksha (Grand Puppy)  , Raelyn  |