We got Lady when she was 7 weeks old and started with her straight away and she was fully trained at 4 months old.She was wonderful after that,NO accidents what so ever..until we got Jess,our other yorkie girl when Lady was 7 months old.Since then she has NEVER been the same and will not use her pads,she pees in our shoes,on our feet,under chairs,under the beds etc..everywhere but her pads.She is now 17 months old and having to be cofined because we just cant re-train her,she has no interest or intention in using her pads,and although we have tried EVERYTHING she is as stubborn as a mule.I have lost hope now because she is almost a year and a half old