Would need to know what the method IS. What does the trainer actually DO? What training aids will be used? Does this trainer have a website? I think it's ok for you to post a link to a trainer's website.
Franchise trainers, can really vary by location. I would not darken the door of one closest to me, I did talk to them and was impressed - in the negative. I didn't like the nearest of another big chain, my friend did; so how they mesh with you and your ideas and your dog is also important.
A membership in one of the US links at this Canadian website might be nice. Ask your Vet too, friends, go to see a session with another dog first, if you can. Remember, there is no legal requirement or agency checking out what dog trainers say or do. Anybody can hang up a shingle proclaiming themself to be a trainer.
How old is Rocky? He looks a bit big (meaning too old) in that snowbank picture for a puppy method that worked for me. But if he's under the recommended 16 weeks you can check out what I did at:
Snowshoe's Album: Teaching COME
LOL, no shingle at all for me but it did work for two puppies very well.
No matter how successful the training I personally would be very careful of letting a young dog run loose on my property. COME will only work if you say it. And for that you need to see the need first. I think what you really need is boundary training. My lot is small enough to fence. You might look into invisible fencing. I have had dogs that would stay in my yard without a fence, my neighbours do too. More of the dogs around will happily leave their yard, though, all it takes is another dog walking by, a squirrel, a cat, a leaf, a bicycle.