On the program it was 1 man in Northumberland and over a set period of time he eradicated 1% of the estimated population. The project was backed by 1 man in the house of Lords (I think) and had to stop due to lack of funding.
So what I'm thinking is
.......
If we get 100 people to do the same as him, at the same time - then BINGO, no more greys and we can watch our very own little 'tuftys' flourish again !
On the point of the dogs retriving them - maybe they know that they're just vermin with diseases and don't much fancy the thought of having them in their mouths ?