It’s one nasty turf war.

Furious coaches, parents and neighbors staged a showdown with snarling dog owners at a popular but feces-filled Brooklyn ballfield over the weekend that included some pooch-lovers appearing to threaten violence — against kids.

The team of sports supporters launched a “get-our-fields-back” effort Saturday, bringing pint-sized sluggers to play ball at the 3-acre Green Central Knoll park in Bushwick. 6

Its field has become popular with rogue dog owners who slip past city-posted “no pets’’ signs and through a torn fence to stroll around with their off-leash canines, which dig holes on the field and leave behind slippery waste.

“When does the game start?” an unwelcome dog owner asked Saturday, adding as if it were OK to walk their pooch: “I’ve seen them play ba

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