Did you know that it is possible to get a dog hair splinter? Aaron came in from walking the dog and said he had a dog hair splinter and I totally did not believe him until I got it out myself and it was a hair!
Then I googled it. Apparently, hair splinters are more common than one would think.

Here is a link to a case report of a diabetic woman who had a hair splinter and didn't even know it: http://thefootblog.org/2006/11/16/foreign-body-hair-abscess-of-the-foot-a-case-report/

It caused an abscess. Don't forget to look at the pictures!