did the vet run any tests? I have a simply wonderful chocolate lab who was brought to be euthanized on her 4th birthday cause they could no longer breed her. Thankfully, she was rescued and came to me and is a fabulous girl. Anyway, she used to lick any and everything...grooming like crazy. The vet ran some blood tests and it turned out she had hypothyroidism. With daily synthroid (like with us humans) the condition is easily treatable and the licking stopped within a day. So, first, before you do any home remedy, check her out with a vet. Having said that, it may well be a habit of boredom and with increased activity and love, she may be convinced to develop new and better habits.