You need to take a step back and ask yourself, did I really put in an honest effort? Practicing for one hour, once a week will not make a trained dog. Owners need to follow through at home, at the park, on a walk, or where ever they take their dog. If you don't do the homework, don't expect your dog to heed what you're asking.
As the old saying goes, practice makes perfect, and it's no different in dog training. This does not mean that you have to drill your dog for hours on end, each and every day (that gets tedious and boring). It means that if you take 20 - 30 minutes out of your day, every day (say, during commercial breaks, or when it's doggy dinner time), spread it out, and practice in short bursts, keeping it quick, fast paced and fun, you will see much better results than if you rely soley on the once a week classes.
It's unfair to expect your dog to take you seriously when you put in little to no effort.
There is, possibley, another reason that your dog might not be listening, and if you've put in the effort and the time, but are still not seeing results, it's time to revisit the method thats being used. Sometimes a shift in the techniques you are using is required. Not all dogs respond the same to each method. If you think this might be the case, talk to your trainer and explain your worries, that is of course, only if you can truly say you've done your homework, and no, the dog didn't eat it.
