Many people surrender their pets to shelters because of exhibited jealousy from their dog after a new baby’s arrival and fear of the infant being harmed by the animal.
There’s a difference between disobedience and incomprehension. If your dog isn’t obeying a command because he doesn’t understand what it is you want him to do, that’s not a behavioral problem at all;
Licking is a completely natural behavior for dogs, and most of the time, the experience isn’t something to worry about: the odd lick from a warm, moist tongue on your hand or ankle is, at worst, tolerable
The act of chewing seems to be a matter of individual preference among dogs: some have an innate desire to chew as a pleasurable activity in itself, and some seem to have no need to chew whatsoever unless they’re driven to it out of sheer boredom.