I've been reminded that it's to keep (future) grandchildren in as well
as the (future) dog, which will be a Border Collie, so electrification
is not an option!
If its a Border Collie - think carefully about how high you will need
the fence.

Maybe deer netting rather than standard stock netting.
Make sure your end and probably a middle post are large "strainers" with
supporting struts to take the tension of the netting.