Many if you told me your dogs changed at 4 months old. That seemed like a lifetime away from where I was at when I read that. But, Sophie is now 17 weeks and she has DRASTICALLY changed (for the better!). I don't know if it's the age, or things I have been doing, or a combination of both, but my puppy is drastically different. She has almost stopped biting aside from certain things like when she has the Zoomies and I go to pick her up or try to unravel the leash from around her legs. She is actually LOVABLE and I can pet her all I want with no biting. I can put my hands up to her mouth and face with no biting. She actually enjoys chewing on Yak sticks more than my feet or hands. She seriously is like a different dog. She is able to spend a little more time outside if her crate just relaxing and chewing on her bones and toys and needs less attention, but she's not ready to be out all the time though. She is still getting into new things in the house (like a new rug I bought) so I'm having to teach her "leave it" with new things all the time. She's still horrible on walks and leash pulling, but she learned "off" in just 2 days and learned "with me" today after 3 sessions. I'm able to leave her for a few hours (something I only did once at 3 months and she had meltdown separation anxiety!), but for the last 2 weeks I give her a stuffed frozen toy and she excitedly goes in her crate and when I come back home, she's peacefully asleep or just chilling out in her crate with a toy. I haven't had a meltdown in over 3-4 weeks and I actually enjoy playing and interacting with my puppy. Hang in there everyone, it will get better! She's teething now and lost 4 baby teeth so I'm sure chewing will start to get worse but my puppy is manageable and I'm getting my life and my sanity back little by little. Anyone have advice for leash pullers? She has meltdown when I try to put a harness on her and I've tried 6 different kinds. So we are back just her collar. It's probably bad that I've let her pull for the 2 months I've had her, but I'm really trying hard to work on this. If anyone has tips - please let me know. How long did training your dog to leash walk properly take???