Do Androids Dream of Electric Sheep?

A specific scene that I found most interesting was in chapter fifteen when Rick brings home the goat to Iran. She is excited and not depressed anymore because now they have a real animal and not an electric sheep. Rick's neighbor compliments them and spirits are high. A part that confused me though was when Iran says she got hit by a rock. I wasn't sure what exactly happened there. But, overall I thought chapter fifteen was really amusing because its full of events. They get a real animal, Rick tells Iran he empathizes for androids, and he doesn't want to be a bounty hunter anymore.