thinking along the same lines "Is he bored or stressed?" looks to be behavioural , obsessive behaviour -- flank sucker ASPCA | Compulsive Behavior in Dogs
instead of having an urgent itch and scratch biting at themselves dogs with this obsessive behaviour "sooth" themselves while doing this and have this almost trance like look .
The flank sucker rarely injures himself - only sculpts his hair .
I had a young male that was crated and in the area where a mature male was present and females . When those females came in to season he would be anxious (excited) and start with excessive grooming , not injuring the skin , not discernible , never caught him at it - just the results , which were like your dog with the hair over his back leg looking shaved . When the females finished cycling he left his hair alone and was normal. Females cycle - he did it again . Some where along the way he got addicted to this habit - so it is pretty much a permanent look.
He never has never will be bred , even though he trained very easily and is a steady confident dog .
I had read that obsessive behaviours could be caused by high cholesterol levels . "
Journal of Small Animal Practice
, studied many different breeds. They believe terriers, German shepherds, Anatolian sheepdogs and dogs originally bred for herding appear to be more prone to tail chasing.
Have you recently had your dog’s cholesterol levels checked?
The majority of dogs with obsessive tail chasing in the recent study were found to suffer from high cholesterol, with HDL and LDL cholesterol both significantly higher than in dogs that only chased their tails on occasion. High amounts of cholesterol may clog cell membranes at the microscopic level, affecting flows of brain hormones involved in mood and behavior. High cholesterol has also been linked to people who suffer from panic attacks and/or OCD.
If you suspect that your dog might chase its tail too often and could have high cholesterol, experts suggest the following "
so with a higher dosage of fish oil, and lecithin granules or liquid lecithin sourced from sunflower seeds he was able to stop himself , even if a female was in season.
Now he gets an oil that has unrefined rice bran oil , a very good source of phosphatidyl serine and choline .
I'd rather have this than a tail chaser , same syndrome.