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It is my understanding that all mammals have an os penis except man.
That is not the case.
"The only mammal species without baculum are the humans, horses, donkeys, rhinoceros, marsupials, rabbits, cetaceans (whales and dolphins), elephants and hyenas."
I'm not sure why deer (which would include all cervids I would think, and cattle were not listed among those that don't.
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Unlike tiger penises,
however, deer, horse, and cattle penises lack a baculum.
http://www.lab.fws.gov/lab/docs/idnotes/pdf/TigerPenisIDN6.pdf
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For the life of me I can not understand why anyone would be interested in this particular part of a canine.
Not only are people interested in it, they spend a lot of money on them and go to great lengths to "counterfiet" those of certain species, as seen in the link above.
Orientals have some strange practices.