I would have him neutered. I rescued an 8 year old male yorkie that was never neutered and marked in the house where he lived and that's the reason I got him because he was always marking and he is such a sweet guy and when I talked this friend of mine into sending Murphy to me at 8 years old and when I got him I had him neutered "immediately" and the marking stopped (he went outside to potty and was housebroken in no time) and he has been so happy and healthy and he's now 14 years old. I recommend having him neutered. Fletcher will be happy and healthy
Donna Bird
Brookynn's Yorkshire Terriers