Hi everyone. I am a new member on this board and I desperately need some help with my puppy. I have a 4 months old male standard poodle puppy. I just got him from a breeder about 10 days ago. He is house trained and crate trained. and he behaved well when I took him petco. I take him out every 3 hours to pee. And I also walk, run, play with him outside. He is very curious about just EVERYTHING. he eats dead leaves, rocks, dirt, grass, etc. The vet said that it's normal for puppy, and grass won't do too much damage. But it is almost impossible to leash train him because he's constantly sniffing the ground and chewing on things. About 3 days ago, he started to refuse to come back inside my condo building. Once he realizes that we are going to go back, he stops, then sit down, sometimes even lies down. I tried to pull on the leash gently and he wouldn't budge. I also squad down, make high pitch voices, clap hands, tried luring him with some treats, but nothing really worked. After he finally come inside my condo building, he would do the same once he is in front my condo unit. He just lies down by the staircase in front my door and wouldn't move. Does any of you have the similar experience? What can I do to correct this behavior. I am going to start clicker train him in a few days. Maybe that will help a little bit?