We have a 12 month old Bichon Frise Female Puppy. She is as a rule house trained, but we have problems. I find her infuriating although I'm sure it's our fault. I take her out for a walk first thing on a morning & last thing at night at which time she does a wee & poo.
My wife when she has chance takes her out during the day. However if she is in the garden she generally doesn't wee & definitely never poos. She has been in the garden most of this afternoon & as soon as we bring her indoors she wees in the kitchen (when no-one is looking). I want to get away from her weeing & pooing on walks so have been trying to stand in the garden while she does her business. I stood there for an hour & nothing, put the lead on started the walk & she produced straight away.
The problem with walking her & pooing is that she never lets us no she needs to go out.
We started doing the walking because we were standing in the garden for hours with her when we first got her & she never did anything & we thought that the exercise of a walk would get her going.
She always soiled her cage from first getting her & this has only just stopped.
So I need to know how can we get her back on track? I know that it's harder with an older dog. I know about rewarding her with treats but she won't go at all to give her the reward.

Any help would be appreciated, thanks in advance...