its not the breed , its the heart ,
Iv got a yorkshire terrier with all the heart in the world, she really is a game we thing but would she catch a hare Its not just heart, if the ability and breeding isnt there then the amount of heart isnt going to catch the hare. In my opinion its all about the mix of ability, breeding, stamina, heart, fitness and how the dog is enterd that determins wether the dog will become a good hare dog. If the dog wants to run it will, but if the lungs and stamina isnt there it wont be able to stay.
David