OT -- Military Animal Identification

[Ed the Coastie]

This is going to sound kind of bizarre, but I need the information for this year's NaNoWriMo (National Novel Writers Month) novel. So I figured that perhaps someone here would be able to answer a question for me...

I know that the US Military uses animals (dogs, horses, dolphins, sea lions, etc) in various capacities. My question is...how do they keep track of them? Are animals given part numbers and designations, like equipment? (NSN 9134-27-163-5982 -- Dolphin, Mine-seeking) Or are they issued individual serial numbers similar to human personnel? Both/neither?