If you are going to murder someone, you do it simply and with high certainty. After all, complicated and bizarre schemes might be entertaining in TV shows, real life killings are far more mundane...and believable. So, if you're looking for believability, this is an episode to skip!
Someone has it out for some of his fellow soldiers who served with him in Vietnam. Who this is, no one knows. But instead of a bullet to the head, he uses a method which could EASILY be avoided...he trains dogs to kill. Sure, such an attack would be pretty cool, but even a big dog like the Doberman in this one is NOT certain to be able to kill someone. Perhaps having a pack of dogs would have made more sense. All I know is that so much of what follows also makes no sense and the episode just seemed sloppy, clichéd and heavily in need of a re- write. A few of the other sloppy elements were the guy who got blown up by a grenade....who actually LOOKED amazingly undamaged despite a close encounter with the weapon and it SHOULD have blown him to pieces as well as a guy with a snub-nosed revolver taking out a guy shooting back with a rifle and scope (only in TV would such a thing normally occur).