I'm still learning this LGD thing too. My goats HATE the dogs. The dogs LOVE the goats. Not a good mix.
Yes, normal seems to be licking (grooming) and sniffing butts (like they do with each other and their humans). That is pack behavior, which is what you want the goats to be to the dog. My 2 Great Pyrs seem to sniff butts more than any other dog I have ever had, mine, the goats or the other dogs. They even try to sniff chicken butts and horse butts.
DragonLair Farm in Central Maine. Nubian, Lamancha, Oberhasli, and Mini dairy goats, 2 horses, 8 dogs and not sure how many chickens.