It was parvo that killed the Staff 
, the vets confirmed it a few days ago. But we can't be sure whether she picked it up at the pound or elsewhere, as no other dog at the pound showed any signs of it, so there is nothing we can do.
The Whippet settled in well. She is a nutter, but a lovely nutter. She went back to be spayed this week. He is picking her up in the morning and she is staying with them for good 
The ladies in the rescue are that pleased with the work he has done with her, in improving her recall and calming her down, they have an equally loopy Saluki lined up for him to foster and train for a few weeks prior to her being ready to rehome, once the Whippet is recovered and my Dad has had his op.
Looks like he has found himself a new little project.