I get some questions about this from time to time, so I'll go first.
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Mine requires some imagery and a bit of a sad story to explain...
One of my old cats - Squirt - was diagnosed with diabetes a few years ago. Cats (and dogs) use the same insulin that humans use, so I started getting my supplies at Walgreens. Talking with the pharmacist about this, they recommended a 'Prescription Savings Program' that is for non-insured members of the family - including pets.
So I get this card in the mail..
The name stuck. (we ended up losing him to cancer back in 2010, but 'SquirtTheCat' lives on)
He still gets mail from time to time!