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I don’t think they’re aware of age either, but the thing is, like human beings who suffer with dementia, dogs can still be happy, and I think mine are, so I won’t consider doing the dirty deed just because they're old. If I can stop the barking at night I’ll be happy. I can cope with him pinching the odd biscuit and even sharing my sandwich. Having said that I do wonder if ultimately I'm being fair to either of them though (the little one is incontinent too - as his sister was - and has to be watched in case of accidents - fortunately the floors are tiled). How long can they last like that - and is it fair to allow them to continue like that? I think I'm arguing with myself here! It's so difficult! Just awful.