Four years ago, when Muhammad Abu Khair took in his first dog, it caused a family feud. His daughter brought home a stray that was wandering the streets of Jabalia, a district of Gaza City. He was unhappy about keeping it, a common feeling in Gaza’s conservative society: Islam views dogs as unclean and frowns on owning them as pets. But he relented, hoping to make his daughter happy. His relatives were not so understanding. For a while they stopped visiting the house.