Long story short, your issue is likely jungle rot, rain rot, trench foot, athletes foot, jock itch, etc. it’s fungus caused by gradeux absorption in porous concrete and subsequent contact with your dogs. The reason light colored dogs are showing it is the same reason white faced cattle get cancer eye and pale skinned honkeys like me bake. Sunlight sensitivity. High heat and direct sunlight stress the dogs, their lowered immune system allows fungal inflammation to set in.
T-Bob it’s a short story but it says it all...
