I wonder if there is Gluten in Skinners puppy food ? I know the Duck and Rice field & trial is Gluten free, I;ll give you some of the adult food at the weekend. The rash looks abit like what Sarek had, which does also look like a flea allergy. Sarek had an allergy to Gluten and fleas, i could come home from work and find he had chewed all the fur off of his back legs, but has soon has i started using spot on flea treatment and put him on a Gluten free diet (we done a trial for skinners) things started to clear up and never came back.
I remember Logi's leg.