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Snowboots has a split personality. Lou Ann indicates that the two disparate names of the cat reflect two different personalities: when called Pachuco (named by Angel), the cat acts accordingly, but when called Snowboots, the cat adopts a different manner.
"Oh, no, he never does. I think he has a split personality. The good cat wakes up and thinks the bad cat has just pooped on the rug. See, we got him as a kitty and I named him Snowboots but Angel thought that was a stupid name so he always called him Pachuco instead. Then a while back, before Dwayne Ray was born, he started acting that way. Angel's my ex-husband, by the way."
The Bean Trees