We have a chihuahua (long haired possible Yorkie mix) and Peanut although she really tries sometimes, is incapable of doing any damage to flesh. She's all of four and a half pounds though. On the other hand...or should I say leg, my neighbors have a chihuahua that I call "the one eyed pirahna"! Honey is fully capable of removing chucks of flesh...so I avoid her. Having five (like her) coming at me at once could be messy.