Yorkie are supposed to be good for allergic people. as far as i know that is true. my mom is a major asthmatic and so is my husband, my sisters have really bad allergies and none of them have it around the dogs.
I know i told all of them even if they did get allergies from the dogs that they better find there own way to fix it cuz my babies aint going nowhere.I ofcourse say thing joking but still mean it..lol. good luck with helping him with his allergies.