It's an interesting topic to be sure. Kip was especially prone to lick granulomas, so at one time, dealing with OCD type stuff was an every day thing for us. Just a couple of comments/clarifications? from me...
Dobes, of course, are well known to have flank sucking or blanket suckling in their repertoire of tricks--included or maybe related to that but not specifically mentioned here, is excessive licking (which is not exactly flank sucking, per se.) A dog will lick obsessively at his legs--top of the wrist in front, ankle joint in back, typically--enough so that he creates a sore...a lick granuloma. My personal impression is that the dog may have a thorn or a skin irritation or perhaps a sore joint, a touch or arthritis--whatever--so he starts licking. The licking action feels good (releases endorphins, I've heard), but it makes the sore place worse, so they lick more. Soon, it is a cycle.
Underlying anxiety plays a role in it too.
They are very difficult to treat, because the licking has become an obsessive behavior; even if the original irritation is gone, the obsession stays there. With my one granuloma creator, at least, it became a "closet" behavior. If I was sitting around somewhere and he wasn't in the same room (because, of course, dobes typically WILL be in the same room with you if you are just hanging around--they like to hang with you), or if I saw him sorta sneak off, I could be sure he was somewhere licking away. And all it takes is a lick or two to an area where you have managed to start some healing going to open it all up again.
We have a thread somewhere...lots of threads, actually...Dobes are so OCD prone.
Anyway, here are a couple about lick granulomas, in particular:
"Need some help/resources for lick sores" https://www.dobermantalk.com/doberma...ick-sores.html
"Lick Granuloma (and OCD??!!) Breaking the Bank" https://www.dobermantalk.com/doberma...king-bank.html
Another point to add--a lot of OCD-like behavior is rooted in anxiety. And a good starting place at relieving anxiety in a dog is making sure he is getting plenty of exercise and mental stimulation.
Here's another article about dog OCD--it is actually so similar to the one you posted, Ken, except with a lot more detail, that I wonder if they are from the same source, or if yours is a summary of this one?? Anyway: https://www.whole-dog-journal.com/be...-for-ocd-dogs/ from Whole Dog Journal by Pat Miller