hens out of the run?

I have got my first two hens,light sussex.They are safely tucked away at the
moment.Is it a good idea to let them get used to us and there new
surroundings before we let them out of the run and roam the garden
supervised?Or will they stay nearby anyway.My only worry is my neighbours
two border collies which have the run of there garden,they have never
escaped though.We have a 6 ft hedge and fence.
Thanks Keith


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