I've never had a female yorkie, but I do have 2 males and Deegan my 4 yr old was 1 yr old before he stopped having accidents in the house. I've had him since he was 12 weeks old.
Trooper is my rescue pup. I got him when he was about 1.5 yrs old (this past January). He will be 2 yrs old in July and he still has accidents in the house - quite frequently.
