Another neighbor, Marisol De Leon, 40, said Ms. Cooper frequently walked Henry unleashed, and became irate when told not to. “There was a sense of entitlement,” Ms. De Leon said.

Alison Faircloth, 37, a neighbor and dog owner, recalled that last winter, she came upon Ms. Cooper on the verge of tears outside the building’s lobby. A doorman had cursed at her for no reason, Ms. Cooper told her. Ms. Cooper vowed to get the doorman fired, Ms. Faircloth said.

But when Ms. Faircloth asked the doorman what had happened, he told her that Ms. Cooper had complained about a broken elevator, then cursed at him after she barged into a security booth and had to be removed by a guard.

“There’s always a narrative from her about someone who has done her wrong,” Ms. Faircloth said.