gnu,
You're quite right about not enough information to offer any useful advice, because that wasn't my intent. I think we could be having our very first "Men Are From Mars, Women Are From Venus" moment. You know, the book that talked about the different ways men and women communicate? In sharing my story, I'm not actually looking for a fix, just sharing a story, starting a conversation, maybe hoping for a "me too" or an "oh yeah, I know someone who..."

To answer questions: If by papered you mean CKC registered, yes but not for breeding--he is altered. Can you clarify what you mean by "How long did the dog get interaction before separation" (do you mean separation from mother). And, few come and go in our house, and certainly that doesn't help with early socialization.

Things are not as serious as you seemed to conclude, probably my fault for describing his 3 week outburst as unruly terror or whatever I said. That was an expression of emotional impact, not a statement of objective fact. I expect and, other than that episode,, always get very good behaviour from my dogs, so when the opposite occurred it got my attention in a very big way. In the scheme of things I see far more troubling dogs than Mulligan on any weekend at the dog park.

Nearly every time I walk where I'm not already known, people stop me to ask how I get my dogs to walk so well. That stop-and-talk causes little pulling and no jumping, but lots of appropriate sniffing and if they find the person has treats, they'll offer a sit on spec. That's been the case even when Mulligan's unacceptable behaviour was emerging over those 3 weeks that so adroitly got my attention.