i always thought the pronged collars were horrible............ untill my mom got lani (a mixed pound puppy who DEFFINATLY has some herding dog in her) She pulled like no other, she still does even with the pronged collar but at least it is not as bad....... i couldnt imagine using anything but a harness on these little guys.... when i had a cairn terrier i started out with a choke chain, but it didnt do any good so i used a harness instead adn it worked wonderfully ( he used to yap when we were walking adn the only time he would shut up was when we were running, silly dog
I've actually seem someone with a yorkie at petsmart looking at the pronged collars and trying them on her dog

i was horrified, i wanted to take her dog away and slap her on teh wrist..... these guys are sooo smart and they learn fast it just takes patience