Yes your story sounds so commen at my house hold & I as well have a five year old Choclate Lab that has had all kinds of problems. Thyroid was the major factor & had to be on all kinds of medication & blood work done every week & then diabetic & then all kinds of skin problems & one thing she would do was lay with her hind legs behind her or on her back with legs straight in the air & my Vet stated that with the medication she was on & the thyroid problems that she had Hot Spots in her inner thighs & that was her way of keeping her hot spots within her thighs cool & the rubbing on the ground with legs behind was relaxing. Hope I helped.
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