Hope he can train durability and teach how to have good feet and wind ,greyhounds are top of their game ,I agree that much ,but have their limits,are highly tuned athletes and nothing compares, that break when they hit stuff at 40mph ,think Ferrari doing the Paris - Dakar.
it's been tried loads of times and people had a great idea! They crossed them with other dogs and made Lurchers and they done the trick
Of course a greyhound will catch (quickly ) but I for one wouldn't pay the kind of money wanted for a well bred greyhound http://www.greyhound-data.com/litter.htm?land=uk when a lurcher