There's probably a VERY simple answer to this, like the salt or something. but lately here it's been rainy, this area is know for red clay. so the bottoms/sides of my boots are covered in it. I noticed about a week or so ago, my youngest cat, Harren, looked like she was sniffing my boots, ok no problem, but then she started licking the mud O-o now she's gotten the other two, Paint and Emry into it, every time I come into the house they all gotta lick the clay on the bottoms, but they're not just licking it now, they are EATING it it doesn't make them sick, and they act normal, they're all fed raw, which is pretty balanced in terms of everything a cat needs, but I'm worried they're lacking something in their diet. I know clay has salt, so are they going after the salt? o-o when I was little, our dog used to eat red clay as well, but then again he was a lab mix and would eat anything smaller than he was. but I've never seen cats do it.