A.C.
Hi A.,
I wish I knew what advice to give about this! I raise collies and this is an issue sometimes. Licking is a submissive response so that is usually where I hear the complaint -- an owner's dog wants to lick their toes, legs, etc. all the time. Punishing the dog will only make them more submissive -- hence, more licking!
Mother dogs also constantly lick their young puppies up till 3 - 4 weeks of age. They are cleaning them and I'm sure this helps with the bonding process too.
An animal behavior specialist might have some good insight on this. A university with a veterinary program might have an animal behavior program at a reduced cost.
God Bless,
A.