I read an amazing article many years ago about an experiment training sea bass to respond to a tone and swim back to a certain location for feeding. At some point the signal would entice them to come back for the last time when they would be caught and harvested for food.
Dog Training Blog
A good strategy for dog training is to be aware of your rewards and how you use them. I recommend something called the calorie bowl to avoid over treating. But, using treats wisely is important for both keeping your dog slim and fit and creating the best environment for a motivated dog that loves to learn.
There are many strategies to work on teaching your dog to come to you faster when called. One of my favorites is to work on a distance "stay", and then ask the dog to "come".
Want a fun training activity that you can practice inside and outside? Teach "Go Find Someone". The long-term goal is to ask your dog to find a family member by name and then your dog runs off and finds that person! If you are really savvy, you can combine it with a "Hold" and have your dog be the family messenger. Write a quick note to your son, 'Dinner in 5 minutes', give it to your dog and then say, "Go find Josh". Your dog will bring the note to Josh! How cool!
I realized that I never taught my dogs what "Come on guys let's go for a walk" meant. That was many years ago, and since then I have taught them that, but it reminded me of the importance of consistent teaching and that . . . dogs don't understand synonyms!