Ok, Photos of the fence attached.
Apologies for the overgrown state, We do the gardening fortnightly
You can see where I have tried to fix it, and probably why it's not working - there were stakes behind the board and bits of wood that aren't there anymore... The rocks go in almost the entire way to the fence, so I can't put star pickets out a bit from it. I've included two photos showing where Batty is getting up on top of the retaining wall. I'm thinking putting a temp fence there may be the best chance. But I'm also worried about Levi getting into our yard and hurting Batty. The last star pickets I put in were dug out by Levi and dragged over to his side of the fence and I haven't seen him yet.