Walking, running exercising, do we only get a dog used to fences if he is behind something?
imo and all the other lads i know over the years, bar none run dogs young to get them used to the dykes and other obsticles, i`m not saying thrash them. i`m saying give them runs and then hold them back to suit the dogs needs, getting behind something is the best way to do that, and getting back on the subject of yapping, i have never seen a case where running too young makes a dog yap, its in there genes if they are a yapper, some yap and some will never make a murmur no matter how frustrated