Please - no judgments! We purchased a puppy from a breeder in Aug. He was four months old at the time, is almost 7 months now. Breeder had many positive reviews and we rushed into a purchase without doing the proper research on the breeder (dumb I know, but first purchase, first two GSDs we owned were rescues, we were grieving loss of our 9 yr old GSD to cancer in July). Dog has Czech/DDR lineage per pedigree on sire's side with many Schutzhund titled ancestor dogs. He appears not to have been properly socialized during the critical period before we brought him home. We have been trying to teach him manners. He is very smart, and will sit on command, is house-trained, and we have been working on the leave it command. He is also crate-trained. Very food-motivated, BUT has shown aggression (no actual bites so far), snarling, growling, lunging at visitors, other dogs. He's a big dog already at 64 lbs, very handsome, playful, but also intense, restless, and very high energy. He has a high prey drive and we fear for our cats' safety. He needs someone who can establish leadership with him. We had a professional trainer with over 30 years of experience at our house for a one- on- one training session. He did not like her correcting him and he went for her throat, nipped her chin. It was a warning more than an actual intent to bite I think. Obviously he could have done real damage if he wanted to. Trainer said he needs a very select person to re-home with, and hooked me up with a contact at our local Humane Society who has successfully placed another such dog with a Shutzhund trainer. But in talking to vet yesterday, if this person will not take him or knows someone who will, he will probably be put down if we turn him over to the Humane Society. He needs a home with no children (our son is 15 and he has been okay with him), no other pets, and a very experienced handler. Help! Breeder's father has expressed interest in taking him, but I'm reluctant to send him back there.