They have a bone to pick with this crappy dog mom!

A mystery pet owner apparently has been refusing to pick up her pup’s poop on the Upper East Side — so a barking-mad neighbor put up signs to shame her into cleaning it up.

Fed-up residents are making a stink over the careless repeat offender, who most recently left her medium-size mutt’s steaming pile in the middle of a crosswalk Friday, according to a witness.

“The dog took a s—t right in the middle of 84th Street,” Elvin, a 46-year-old doorman at 90 East End Ave., told The Post. “When her dog pooped, she had no reaction. She looked. She just kept walking.” 3

The inconsiderate pooch owner, who hasn’t been identified, barely blinked when a neighbor hounded her over it, he said.

“[Another] lady started saying, ‘Ma’am! Ma’am!

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