My cat looks like a cow

We're going up the stairs to the 3rd floor after gym and D. is looking around, talking to A., bending over and touching her toes...not moving forward with the rest of the girls in the girls' line. So I say, "D.! Get with the program!" She gets very flustered...trying to explain to me that it's Thursday and, "No, but...Ms. Powell, but there is no after school [program] until tomorrow."

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Background:
Early in the year, I was teaching some writing lesson, modeling with a story that involved my apartment and my cat, Isobel, who is black and white. I wrote some words about what happened, and what the apartment and Isobel looked like, and drew a picture with details. Since then, Isobel went to live with my old roommate, Jon and I got a new cat named Sammy (who is dark brown/gray), and Isobel came back to live with us. My phone desktop is a picture of Jon and Sammy.

So we're on a field trip and I get a text message from another teacher. I go to check it, and E. is looking over my shoulder. "Who is that?!" she demands, pointing at the picture.
"It's my boyfriend and my cat," I reply.
"That's not your cat, Ms. Powell!"
"Yes it is! What do you mean?"
"But Ms. Powell, I thought your cat looked like a cow!"