Is she touching your hand Kay?
i guess it's your greyhound Kay
Try covering the treat with the whole of your hand and let him sniff it, gently opening it , if he tries to snatch reprimand him, if he gently sniffs etc open your hand more carrying on until the whole of the treat is revealed.
Remember he's probably not used to treats and if he is like any greyhound I've had he'll want to bolt any food down as quickly as possible. whole litters of greyhounds are often reared together for a long time so they have to eat their food quickly.
Good advise, and will she let you near he