Austin W Smith

Seems to be an issue as far back as 1.8.9, probably further

That's been the correct and intended behavior since Java 1.8 (not beta), see here: https://minecraft.gamepedia.com/Wolf#History

Also from the Minecraft wiki: "Standing tamed wolves attack skeletons and their variants without provocation, but not sheep, baby turtles, passive rabbits, or foxes."

Before submitting a bug, be sure to check older versions of the game, as well as the wiki and version changes, to make sure that it is a bug.

I recreated your setup as good as I could, used fill for the acacia fences, and it worked fine for me:

Are you using any mods? What was the exact command you used? Any possible details that could be missing?