Despite all the he said, she said... I would recommend a prong collar, as mike stated. Bunny and Zeke pull like mad with regular 'flat' collars on. Zeke has learned that pulling isnt acceptable and actually can walk rather well without a pronged collar. We've been using one with him for maybe a little over a year.. on and off.

Bunny was a MESS when we got her. She came with a dinky flat collar, so we bought a regular 'choke chain' collar and that didnt work. Tried the halti, and no-pull harness -- recommended for boxers... (Shes a mix.. so yea). Neither worked. She actually escaped from both of these! We even had the halti on as 'tight' as we could without defeating its purpose... We then tried the prong collar with her and she walks great. Correct her once or twice and she knows better than to keep it up. She'll walk right next to me.. turning when I do and so on.

I dont really think prong collars are as 'barbaric' as the stigma associated with them leads you to believe. I see a lot of people use them on 'bigger' or more 'aggressive' breeds.. I think they are actually better for their necks too.. they aren't just constantly sinched around their throat... just my .02.. and then some. =)