Get some books by the Dog Whisperer if you can't get it on TV. It's on National Geographic. You can correct this easily. This behavior is actually the dog dominating your family because no one is correcting the issue at the proper time. Make sure the dog gets exercised properly each day and don't pet him or give any affection when he is acting this way. Good luck.

might be trying to clean the other dog or bond with the other dog... might just like the taste of dog =o

I wouldn't classify this as a dominate behavior. More of a bonding and perhaps it has become a bit on the OCD side even. Dog can develop OCD behaviors, most often licking their own paws, or even chasing their tails, licking walls or the floor. To try and counteract an OCD behavior we want to up the training of the dog doing the behavior (and may as well also work on the other dog too, just not together!) You want to train because training builds confidence in the dog, and it also provides acceptable behaviors for the dog to do. Training stimulates the dog's mind and the body. You can work on all of the basic obedience skills, Come, Sit, Stay, Lay Down, Back up, Go to...(your bed, the door), Go get...(your ball, kong, toy, bone) Get up, Get off, Get down. If you dog is already spot on for these commands, (does them at the drop of a hat each time you ask them to do them) kick it up a notch...start using and training the dog to associate the VERBAL command with a HAND SIGNAL! Eventually, your dog will do the behaviors when you ask or signal them to do them! Consider if your dog is getting enough exercise each day. How can you increase this? Longer walks, summer swims, if you have safe water available....Teaching the dogs to play Fly Ball, or doing Agility, maybe passing the Canine Good Citizenship test and then the Temperament Test and using your dog (s) for Therapy work or even training for Search and Rescue...it's not just for bloodhounds! There are S&R Jack Russels GSDs, Great Pyrenees, Bassets, Labradors, Goldens, Beagles, Westies... (pretty much any healthy dog without a pushed in nose, can learn to track..a good sniffer and excellent health, a willing temperament are the big key factors! A dog that is experiencing Stress can also develop behaviors such as you have described. Mouthing, licking and chewing are a dog's way of "self-calming" so when you train you create a more routine, and consistent environment with a lot of positive reinforcement that may help relax the dog. If this is a new behavior you may want to consider if there has been a lot or more than usual stress in your home, family or outside in the neighborhood, if your dogs spend a lot of quality time outside. Once the dogs have some reliable behaviors that you can redirect them to do, you have a better chance to stop or at least minimize this particular behavior. You may want to consider a possible general health Vet Check to rule out that either dog has developed a medical condition that might also prompt one to be more solicitous of the other. Some dogs will take on a "natural nursing" attitude towards a sick or weakened animal or human.

The older dog is 'mothering' the younger dog. The older dog is also putting it's scent on the younger dog. This happened to my two dogs. What we did was, every time the older dog did this, we would take the younger dog away from the older dog, and cuddle the younger dog, thus placing OUR scent on the younger one. Eventually it worked for us. Good luck