If this is you and your dog then the answer is yes!
For example, this leash pulling behavior will not get better with time. Some dogs are born with a generally laid-back personality and so sometimes you can get away with smaller bits of dog training. Most however, need to be shown by repetition the types of good behaviors and boundaries you expect.
Dogs are bundles of endless energy and so they crave activity! So if we are not filling their time with good behaviors, they will surely resort to what they know: pulling on the leash down the street, jumping up for joy, chewing things up, stealing socks, and running away in the streets! Dogs are not born knowing English so at minimum we must teach them our language! A little training goes a long way! But it is the type of training that determines the ease, speed and quality of your results! At six months of age and older your dog is capable of learning to control his impulses. Doing exercises that teach patience will give you the best bang for your buck and the most significant and lasting results. Truly the best do-it-yourself program is Top Dog Advanced through the LA School For Dogs Online website. This is by far the quickest way to your dog learning impulse control with the support of a certified dog trainer via chat!