Thesunshinesbrightly I can't agree more!
A pup WILL jump up/lick and "mouth". It's what they do, the same as babies cry and toddlers stick KitKats in the video player! Mouthing is NOT biting - it is a natural instinct used in play and something which a pup grows out of.
I work in rescue and see far more dogs which have been abused by people than those who are abusive towards people... and of those which are stroppy with humans it is usually because they have been taught to fear and that an aggressive reaction gets the desired response (i.e. the human moving away pdq) because they have been abused in the past.
There is a huge difference between dogs jumping and covering the OP in mud, as undesirable as that is and as unacceptable as it would be for my dogs to do so, although I wouldn't give a hoot if a dog did it to me, and a dog being aggressive and there is NO call for the crass, unreasonable and plain evil suggestions that dogs should be hurt.
Dogs are like kids, they learn by example and experience. If a kid gets into trouble in the sea he is likely to be fearful of water, likewise if a dog is abused by man he will fear man. Then you have a problem, but is it the dog's fault????
My Grandads dog once sniffed at the legs of a black man on a motorbike. The man kicked at him and for 17 years that dog hated black men although he would never have been aggressive towards them. Why? Not because he was taught to, but because he had had a bad experience.
Yes, yes, yes, train dogs, I agree. But also accept that in the early stages they will act as nature intends them to and equally teach children to respect them and to behave responsibly. I repeat... I am heartily SICK of tellig other peoples DC that it is dangerous to stroke ANY dog without the owners permission. My own kids, brought up with dogs and loving them, were taught to "Say hello to doggie" from a distance, by waving at him until/unless the owner said it was ok for them to approach him. Daft, yes, but responsible? Certainly.