Podocarpus would work. BUT to be effective at dog level would need to be VERY close together.
If you have a year or 2 to wait, I would plant 3G @18" centers.
I have done 7g and ran chicken wire around the inside that was almost impossible to see (if no one sees it, the "fence" won't bother anyone.
Elaeagnus grows faster and would be a much denser and better fence, but need quite a bit more width than podocarpus.
The problem w/ grasses (Lemon, Muhly, Pampas etc.) is the grass will not fill in between at ground level, and needs/wants a bit of space between. Most dogs will easily navigate at ground level through grass that is almost impenetrable to a human.
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