Mature pets have usually passed basic training, which means they're capable of learning new commands. (bluebuffalo.com)
Your dog needs to know lots of new commands, including «over», «through», «left» and «right». (petpeoplesplace.com)
If you are willing to spare time each night to work with your dog on teaching new commands then the German Shepherd could be the breed you are looking for. (caninejournal.com)