Tom, advice Marie gave you works wonders as we did that with our labrador. Me and boyfriend "sacrificed" piece of clothing each and we gave her denta stick (which she loves) when we were putting her to bed . So now (2 years on) when we let her out to garden for her last evening piddle she goes straight to her bed and waits to be covered with blanket as now nights are cold and there is no peep from her until morning