largely depends on time of year mate, might let it have a 'look see' early doors, but no not in deep winter at that age , its knowing when not to run em as much as when to run em,
I had a dog catch one at 6 months, pure accident but it happens. I know what your saying but there is no rush. It sounds good to say if the pups struggling ill slip an older dog but it don't always work like that. Take KC run, 3 minutes that hare could have been a mile away out of sight. It's not like the pups gonna stop if another dogs slipped or the hares gonna just give up the will to live. Dangerous game to play