My dog is dog aggressive and I have questions about a prong collar I bought awhile back. I think it may be too big and I'm not sure if I should just use a dominant dog collar.

I bought a prong collar from Petsmart a long time ago. I am just now starting to try and learn to use it since Levi is having so much attitude with other dogs. By the time I take the links out to get a snug fit around the upper neck. There are only a about 6 links left fitting the dog primarily on one side of his neck. I can't believe this is a correct fit and even with that being said it still won't stay up on the neck, it always falls down. I'm trying to decide which collar to buy from you, the dominant dog collar or a leather choke to work with Levi due to his serious aggressiveness towards other dogs. I told the forum yesterday that the prong seemed to increase his drive and anger towards the other dogs. Anyhow, I guess the dominant dog collar is to be used with the prong?? Or should I just use it alone since I have no training issues with him other than the dog issue? Is the prong I got from Petsmart not working right? What do you suggest I do?

Thanks,
Robbin