@midwifemarley: I saw a video of a dog sticking it's tongue right inside a baby's mouth whilst the people filming giggled. The baby was about 6 weeks old and it made me feel nauseous. Quite frankly, it's nasty. Dogs sometimes lick their backsides with their tongues, and we know dog faeces can harbour worms that can cause blindness in children. As for putting your fingers into the mouth of someone's baby, please don't. That's pretty nasty too, and most parents will not take too kindly to it!