This is something I'd honestly never have thought of:
They're dental floss holders. That dispense the floss out of a dog's posterior region.
Why? Why?
On the other hand, if this is something you really NEED, you can buy them here:
Maybe you have a dentist in the family. One who has everything. Or, maybe you're just… I don't know. Into unique gifts?
My head hurts.
Bluestalking 