From personal experience, they have hella thick skulls. I kick my dog in the head (unintentionally, of course) whn he burrows under the covers, and he's never suffered any ill effects. My feet, however, tend to smart a bit!
Sorry about the headache, but I'm totally giggling myself silly trying to imagine the scenario in which a Dachshund headbutted you! Whatever happened, I'm sure you deserved it! :P
Oh, it is amazing how much a headbutt from a small animal (or a small child as is normally the case here) can hurt. The 'nose push up inside my brain' headaches are awful.
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