I hate to tell her this but spending your childhood being treated by the veterinarian is no walk in the park. 
And until that "cat" is eating Friskies out of a bowl on the ground (and drinking plain old water -- no ice -- outta the bowl next to it) and sleeping in a crate every night. No school, just "spray bottle" learning for that little ****.
I think this is a fairly common thing -- for kids to pretend they are some sort of critter. We were sitting at the dinner table one night when my oldest -- he was 5 or 6 at the time -- started licking the back of his hands. My dad didn't miss a beat, and didn't even look up from his dinner plate ...
Daddy: HEY!! Grandkid #1 wtf are you doing??
GK #1: I'm a cat.
Daddy (again without missing a beat) says: GK #1, you see that flyswatter over there??
GK #1 (tentatively stops licking his hand): Uhhhh, yeah ...
Daddy: Do you remember what happened to the last cat that got on the table??
GK #1 (Puts hand in lap and raises head back up): Uhhhhh, yes ...
Daddy: Yes, what?
GK #1: Yes, sir.
That was the one and only time he tried to be a cat. It was never mentioned again. And btw, Daddy never once looked over at him, didn't stop eating, didn't use a harsh tone. But that's just the way Daddy was -- quiet, pragmatic and you knew you were messing with the wrong guy in short order.
It's funny how things like that shape our lives -- I still laugh at men 3 times my size who stomp their feet, yell and scream and make a spectacle of themselves. But I'll NEVER turn my back on the quiet ones in the corner just watching the show.
