I actually thought of a similar idea for a date.

What better date than to take her to the local pound and have her help you pick out a cute new pet: a kitten! She would think about now nice I was, and how sensitive. And then she would have a stake in the pets future and want to come by and see how it's doing. Good plan, no?
But then I thought about the unworkable logistics: I would only be able to do it once, with one girl. Either that, or i would have a bunch of cats from previous dates.
I could just imagine the scene. We come back to my apartment after adopting the kitten. Then i open the door to the collective "meow" of 20 other cats, scurrying around my apartment. All of varying, ascending ages. All wearing the same blue collar from the adoption pound.
So it was really an unworkable idea. There might be another way to get rid of the cats so she doesnt think i do this as a front. So that she thinks our date was special. But basically the whole thing is too much of a pain. I dont wanna get pets just to impress a girl.
Plus, what if she finds the mass cat-grave in the yard?