Bulettehuskeliste på nettet

The correct answer to this is very easy: That green, hedgehog-like
shaped, abolutely impenetrable object is nothing less than a
Marsians' space ship (that's why you've probably never seen those
"little green men": they are just tooo tiny!
No, seriously: it is a dog's "standard toy". Dogs (in case their jaws will open wide enough) like to take those objects into their mouth, chew on them (our dog - when I was little - used to get nice, big, smelly, guey pig or cattle bones, brought them into the house and used to eat them lying underneath the kitchen table - so, nothing any decent, tidy German houswife would really be up to... that's why this dogs' "standard toy" was actually invented, I suppose!), chase
them when you throw them into your neighbour's tulip-gardens, and
bring them back to you, hoping to be rewarded with a REAL (pig or
cattle) bone!
The hedge-hog-like cuspids are just for better grips (theeth-like, that is...).
 

Oh...? The elf who acquired it was quite sure it is meant for massaging your feet.
 

Well...I, too, already suggested the "massaging"-bit to "bulette", starting out with the idea of feet-reflex-area-massage (though, considering the present object's features, this would feel kind of awkward, stiff and "ucky"... and it definately would be much more fun, if you used one of those objects, which are - same shape, size and coulour as the "Marsian space ship" - ELASTIC and produce SQEAKING NOISES when you sqeeze 'em (dogs really enyoy THAT, I can tell you!). Or - my second hint along that line - you might place the object underneath your belly, back or butt (whichever bodily part of your's is just itching like hell) and wiggle around on top of it.
("bulette" didn't seem to be very fond of either of these suggestions (don't know, why...))