Dog Collars For Training

has anyone ever used this dog training collar for their dog? how thick is a Boxers neck(the skin)?
its called the SPORTDOG SD-105S YARD TRAINER its for stubborn dogs. i have read a little bit about it and they say its for dogs over 15 lbs. so i guess it will work on a boxer. also does anyone know if a boxers neck the skin is really thick like an Akita’s. the only reason that im looking into this collar is because my dog is very stubborn and doesn’t listen to any of my commands i even hired a profesional trainer to work with me and him and the dog wouldn’t even do what the trainer asked. so im at my wits end with this and im wanting to get this collar and try that.
i have tried everything else obedience classes and other trainers. and he knows that im the leader but he doesn’t mind me when i give him commands.
my aunt has an Akita and she is a certified Akita handler, and she told me that they have very thick skin, and she suggested to me to find out if a Boxer has thick skin on their neck.
Hoping you won’t use a shock collar on your dog. Boxers are stubborn, but they are smart, too. Have you tried a clicker training class? Many boxers are very responsive to this type of training. Search the internet for a local boxer rescue group. They can be very helpful in giving you suggestions to help correct problem behavior in a more positive manner.
Dog Training Collars – Explanation of prong/pinch collars