[Jellowstrom]

I think a lot of the problem with the "not my dog" mentality goes along with the mainstream misconception that "it's all how you raise them". So many of the "recommended" dog trainers use the new approach to dog training, which mostly ignores a dog's instincts and goes on the above mentioned misconception. While some of the "new" techniques do work, there is a reason the "old style" of dog training and selection produced far better dogs than you commonly see today.
So many people are jumping on the HSUS wagon, that "humane" lines are actually blurred. It is not "humane" to put your dog in a dog park. Yes, dogs are "social" animals, meaning they have a need to interact with their pack. Putting your dog in a dog park, however, is NOT interaction with their pack members. Instead, you are basically forcing packs to co-exist, which goes against every pack animal's instincts. It goes far beyond breed tendancies, and this is why I tell anyone with an ear to listen to NEVER take their dog to an off-leash/leash-optional park. It is NOT loving, it is irresponsible.