Zoey has elbow spots from the hard floors too. She's had them pretty much her whole life, and they have gotten more obvious now that we live in a house with all hardwood floors. I was actually just at the vets and when I mentioned the were looking redder she said that it was normal and just because of the wood floors. The vet said that if it gets to be really really red and if it becomes open sores (this has never happened to Zoey), then you could put a little bacitracine on them, but other than that don't worry. Also, sometimes when her elbows are chapped I wil rub a little 'bag balm' on them and that helps.