well....i almost hate to be the one to tell you this but, you did ask! i learned about them here myself. they are (ready?) a dried bull's penis.
i was so grossed out by that i almost didn't buy them but so many people here rave about how much their yorkies love them, i gave in. sure enough...lulu went nuts the minute i gave her one.
there are different qualities and i'm sure someone who knows more will chime in. i buy the merrick ones.
__________________ Courtney, Lucky Mom to Lulu |