Wire gauge. Much cheap wire netting is 19#. Where it blocks an established Rabbit route, persistent nibbling fractures the strands:-(
Jacksons are an upmarket supplier but I don't think any treated softwood post will actually last 25 years in normal soil unless pressure impregnated with creosote. Actually the post and rail fencing on our by-pass is still sound after 41 years and not creosote. Whatever they used smells a bit like mothballs and stops the wood burning!
Just for info - illegal in Wales !!
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.
And soon elsewhere.
Which is one way an electric fence can work. We had a collie cross who used to jump out until we put an electric wire along the top of the existing fence. After one attempt at that he never tried to jump the fence again.
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