I have done all of Parker's training on a flat collar. He's 10 1/2 months old now and has just graduated from Obedience Level 1. We'll be enrolling in Level 2 shortly.
Now that he's almost 100 lbs, I'm thinking that I should graduate to another collar. Although my previous trainer was very impressed with what we've accomplished on a flat collar, there are occasions where I feel that I should have more control. i.e. When Parker sees one of his buddies walking towards us or excited people greet him
A simple choke would probably do. However, I don't like the kind of pressure it can put on the trachea of a dog (years of veterinary work and crushed tracheas have jaded me on them). I know how to use them properly and would like to think that I wouldn't cause such injuries. ;) So it is an option.
A prong is an option too. Although I don't feel that I need that level of 'power' with him (keep in mind he IS on a flat collar right now). Also, while I'm training him in Obedience (can't use a prong), I also have a problem with the perception of people seeing a prong on a big dog. As if I couldn't control him without it, oh he must be mean, blah blah blah
I don't have a problem with him pulling (very rare) and heeling is getting better all the time.
This forum is great for various opinions and ideas - so let them fly! :D