Kardashian had wanted a calm puppy to add to their household. She has two young kids with another on the way, so having a hyper-active puppy is just not going to fly. She thought of a devious (and ill-conceived) plan to try and swap the puppies, hoping that she could keep the calmer pup for herself.
She brought Sushi over to her sister's house for a play date, but when she went to leave, she "accidentally" grabbed the wrong dog. She brought her sister's puppy, Honey, home with her, but when Kourtney's 5-year-old daughter Penelope was suddenly afraid of the excited dog she realized that there had been a switch.
They switched back, but Kim knew she needed help. She finally found someone that she could help. Cesar Millan is one of the most famous dog trainers in America. He met with Kim and he was able to give her advice on how to handle the hyper puppy.
Apparently Sushi was acting out because there wasn't enough structure in her life. Millan observed as Kim and North played with Sushi, but he realized that they were the source of all her bad habits. They were letting her run around without restrictions and also reinforcing bad behaviors by accident.
Millan was able to give the Kardashian-West family a bunch of advice that will help Sushi become the dog that Kim had wanted. "It's really exciting to know that Sushi's issues are fixable, and she's just a part of the family now, so we gotta work on it."
Really proves that patience is the most important thing when dealing with a young puppy!