I don't wish to alarm anyone, specially because I am not sure if I am remembering things the right way, but my kids pediatrician in Mexico told me once we had to be careful in washing the kids after playing in the soil, because the worm eggs that you can find in the dirt, will hatch in the human stomach and as a result you will have a kid with worms... ( isn't it disgusting???), so, my point would be, I don't want my oh soooo kissing yorkies giving us wormy kisses... if that makes any sense... So, again, I am not sure if this may be possible, but, it does not sound out of place to me... On the other hand, most of us deworm our pets periodically, SOOOO.... lol I think I just answered myself!!