I work at a pet food store. We only sell food and supplies, not live animals (well, except crickets, but those are food, not pets), but all the time we get people calling to ask what kind of puppies we have, or they come in, walk rapidly around the store, and come up going "Why don't you have any puppies?"
We also have a cats up for adoption in the store through a local rescue - we house one cat at a time, the rescue handles the adoption process though, not us. All the time people ask how much we want for them, and then are dumbfounded when we say that they're not for sale, that they're up for adoption through a rescue and there is paperwork to fill out and a whole process.