This sidewalk squabble is no tiptoe through the tulips.

A spring bulbs-obsessed West Villager waged an all-out, all-caps war with a mystery dog walker — complete with a public shaming campaign over the pooch’s petal-imperiling poops.

So incensed was the anonymous resident — and so infuriated by the feared fate of some recently planted daffodils or crocuses — that a surveillance photo of the four-legged offender and his two-legged enabler has been posted at the site of the offense, accompanied by an all-upper-case screed.

“WHAT IS WRONG WITH YOU PEOPLE!!!” the laminated lament begins.

“OUR TREEWELL IS NOT YOUR TOILET,” it continues, still in caps but using red letters, apparently for emphasis.

“YOU HAVE RUINED OUR SPRING BULBS AND LET YOUR DOG DEFECATE IN OUR TREEWELL TWICE THIS WEEK.”

It concludes, “STOP AND GO SOMEPLACE ELSE AND GET SOME MANNERS!!!”

Two complaint posters were pinned to either side of the trunk of an elm outside 260 W. 11th St. on Friday.

They included two time-stamped photos of the dog in mid-crouch within the treewell’s wrought-iron fence, its female handler standing nearby.

The mystery pair struck first around 11:15 p.m. Oct. 16, the poster alleges, and returned days later.

The display created a stir on the tourist-heavy block, home to celebrities including Sarah Jessica Parker and Matthew Broderick — and sparked debate over who’s the bigger jerk in the decidedly first-world tiff: the ill-mannered dog walker or the tuber-defending tyrant.

“I think they’re right! I mean, would you want a dog peeing and pooping in there?” a female West Village resident who declined to give her name said of whoever tacked up the posters.

Others, mostly dog owners, sympathized with the mystery walker over the lack of bathroom space for city pups.

“Dogs pee where they pee!” said Susan Massad, 81, who was walking her year-and-a-half-old dog, Louie, through the nabe Saturday. “I don’t think this kind of stuff actually works, a sign shaming people.”

Property records show Eric Madoff, the Gov. Andrew Cuomo-appointed executive director and CEO of the New York State Insurance Fund, bought the three-story home in 2003 for $3 million. Neighbors said Madoff — no relation to Ponzi fraudster Bernie — lives in the home, now valued at an estimated $10 million.

The dog walker’s identity remained a mystery Saturday morning, by which time the posters had been removed.

“I think it’s probably the person in the picture [who took it down]!” one Villager hypothesized on Saturday. “They’re probably thinking, ‘Screw you! [My pet] can go anywhere!’”

Madoff could not be reached for comment.