Usually it is common with younger dogs, it can happen at any age.
A balanced diet will help--your dog could be lacking something in its diet.
The dog could be bored, having anxiety or lack of nutrients. Be sure
you buy high quality dog food. Remove the feces before your dog eats it.
After you change your dog diet, if the behavior continues, see a vet.
If your dog licks you, it's a sign of affection--your dog is bonding with you
and looking up to you as alpha. They like our skin because it is salty and
they like salt. Before dogs were domesticated, they would eat their own feces
because they did not want anyone to know that they were there. It does not
harm your dog to eat its own feces. A dog can learn this behavior from
other dogs. Your dog could get parasites if it eats another dog's feces, so be
sure you buy high quality dog food. Dogs commonly fed on the waste of other
animals as part of their history--scavengers eating whatever they could find.
If you have more than one dog, the healthy dog will sometimes eat the feces
of the unhealthy dog. This reaction is to hide the weaker dog from predators.
Be sure you keep your dog living area clean.
Professional Pet Sitting Services offered in the Upper to Mid-Pinellas County Area