Its been a 5 year challenge that I havent won yet Calypso. Behind our house is a field and the border between is pig wire topped by barbed wire and running through it all is a beach hedge 6ft tall. No holes, no gaps. The dog seems to see it as a challenge too - he wont go through if he sees me watching though I have caught him climbing the pig wire! God only knows where he goes ( one neighbour was greeted by him as he was towelling off after a shower ) but he does come back after maybe 20 mins. But he wont climb back in.

I think I will try an electric fence.