Originally Posted by daekini
Yet another comment with no real factual basis.
I spent more than would be appropriate to mention here on a well-bred puppy out of a past #1 sire. The pup was reared with children, dogs, adults - you name it. Walked daily in a family-friendly 'hood. Professionally trained. Socialized, exercised daily, you name it - it was done. Fed high quality food. NEVER left alone for more than a few hours in his entire life.
He became an aggressive nightmare at 19 months.
I'm open-minded and will agree that there are plenty of puppies whose temperament gets "wrecked" - but there are many pups who, despite doing everything right - are wrecked from the beginning.
I'm not saying you are wrong - but you aren't right, either.
I agree, some dogs just are not right in the head, even when you do everything "right", you're preaching to the choir on that one
What I meant was: puppy is raised by not-too-savvy dog owner A, dog is conditioned to be destructive and snappish. Owner A has enough, gives up and takes dog to shelter, tells them he's moving - can't bring pets, dog is an angel. Happy Family B adopts near-sainthood-in-shelter dog, not knowing the impending disaster they are bringing home. Dog eats couch then bites child and/or grandma, gets sent to a different shelter. Cycle continues.
Dogs are pretty easy to "wreck", they pick up behaviour problems like fleas. Homeless dogs have unknown histories (well, they may have histories, but whether they are factual is the question). There is a real risk that a rescue dog has behaviour problems that are unknown or undisclosed. Too high a risk, for me personally and many others, to bring questionable dog into a family with young kids.
A puppy OTOH, doesn't have any bad habits..... yet.