I'm a bit frustrated as Cooper is nearly 4 months old and is still not potty trained.. I don't know what I'm doing wrong!! He pees like 25 times a day.. is he just not grown enough? He hits the pad, but he still goes in his cage and doesn't seem to like going outside (and doesn't tell us when he has to go... but we take him out often).... What age should a yorkie be trained? My mother's friend had her dog trained in 2 weeks!