Hello all. I’m new here. Ok...this is probably going to be a bit long. I have had GSD in the past. Done some SAR work and Schutzhund a bit so I’m not unfamiliar. But it’s been about 11 years since I have had one. So getting ansey I decided to buy a 9 week old GSD 3 days ago. I asked all the proper questions on the phone before I traveled 6 hrs to get her. Yes she’s been socialized, walks on a leash etc... we get to the breeders home and there are about 15 maybe more adult GDS roaming the property and 2 pups. The adults were extremely well behaved. Friendly, a good mix of males and females. I get my pup, take her away from the others and spend some time with her. All seemed AOK.....She slept like an angel all the way home. She has been officially stripped of her angel status. I get it she’s a pup. I have owned 4 over the years but never had I had the issues I’m having with this one. Stubborn doesn’t describe it. Leash.. no way.. fixated on my cat and sees her as prey. Won’t listen at all.. can’t get her attention. Her attention span lasts all of 30 seconds. She just goes from one thing to another. From the looks of it she had spent most of her life outside with the other dogs. She was roaming with them when I got there. She s a complete brat. No manners even for a pup. Started using clicker today, she completely ignores me and it. I have had her tethered to me most of the time. I give her a chew toy while she is sitting with me but that lasts 2 min then she’s trying to bit our feet, furniture what ever is around and last night when I told her no she snapped at me. She’s According to the breeder she comes from calm parents which was apparent when I was there. Any ideas as to why this behavior? I’m chalking it up to not enough human contact other than feeding times. I decided to hand feed her to make her slow down, she’s ravenous when she eats . Any input would be appreciated. Thank you.