Thank you for all your comments - I have since spoken to the rescue centre, and after taking Lucy up there and trying out a couple of things and because of her history we all realised that Lucy cannot live with another female dog - spayed or not male dogs were fine as she had previously lived with a load of them and was kenneled with them - am very disappointed that I had to let her go as in all other respects she is delightful, great fun, clean, and loved long walks - but I shall continue looking as I have always had at least two dogs in the house - never more than 4 though!!!! ha ha and when Lucy was being nice - usually on our walks Millie seemed to really enjoy her company and playing with her. Fortunately the re-homing centre I use never give up on any dogs - they have a couple there that are totally unsuitable for re-homing but continue to live there and will do so for there life-time but am sure that Lucy will find the right place very soon.