Will your dominant dog collors fit larger dogs up to 140 pounds?

I was interested in purchasing a couple of your dominant dog collars. I have three akitas, two males and one female, ranging from one-hundred to one-hundred and forty pounds (not fat). I have used metal choke collars for the last eight years of so with good results but of course, they tend to slide down the dog's neck and have to be re-set. In the last six months or so, I found your site and have been very happy with your training methods and products (purchased the leather leash and the DVDs on dominant dogs and pack structure). I was considering ordering a couple of your dominant dog collars but wanted to make sure they would hold up to a larger dog (of course with the proper fit). The two males are adoptions and have been aggressive in the past and I've had to use the airway constriction technique (glad you are an advocate of this technique). They are well behaved now but I would hate to pull up on the leash and have the collar snap. I appreciate any feedback and also would like to thank you for your service as a police officer. I am a police officer in the north Dallas area. Thanks in advance for you reply...

Mike