Thanks for all your comments.The air in number seven(my house)is breathable once more.As soon as I rehang the wallpaper and revarnish my woodwork things should be back to normal.Dotty is a really clever dog,she has already taught me how to do several things around the house to improve her comfort,eg.make sure there is always an adequate supply of treats.She says I am a fast learner and when I do something really nice for her she gives me a big cuddle.MAKES IT ALL WORTH WHILE.