Hi L+B
I would say it depends how many rats and how long it takes, a good session would likely knacker a pup out quickly, 7 or 8 month most dogs would be able to enjoy a decent session killing rats.
thanks mate my pup is 6 month old i wouldent say i would get loads but a cupple ov rats i done a lot ov rattin a few years ago and thought it was mint had a cupple ov terriers then, but im more into my runnin dogs used to go to a pig farm in crook was fekin hundreds ov the little bliters never put a lurcher on them but i can imagine that they would get the pup used to -the odd bite and learn to