As the title suggests any ideas? My boy is just over 8 months old. We are based in Nottinghamshire but have recently spent time in the new forest and in Norfolk. It's not to clear but he seems to have developed patchy fur on his chest where fur is thinning and the sore shown in the other photo. He is fine in himself, eating normally and very active as you would expect for a boxer. He is 25kg and still gaining weight month by month. It doesn't seem to bother him in any way either. I haven't seen him even acknowledge the area so I would assume it's not itchy.