John Savage wrote:
Buy a box of dried dog food, and slip a few tidbits to it every time you
venture into the backyard for the first few days, then ease off to just
occasionally. See whether you can catch its owner out in the yard and go
over to the fence and have a friendly chat to the owner, explain what you
are wanting to do and make sure it's okay with him to give his dog a few
crumbs of dog food, and start making friends with it there and then while
the owner is present. You will be surprised just how easy it is to win a
dog over.

Thanks John. This was going to be my last resort.

I did not feel comfortable feeding the dog, just so I can enjoy my
garden. But short of 'punishing' it, which I'm not inclined to do, I
guess I have no choice, but feed it.