[QuickSilver]

So this dog has learned 3 or 4 tricks from a person who doesn't like him... and he is the most stubborn, untrainable dog you have ever seen? If that's the case, you've been obscenely lucky until now.

Of course the dog is only going to do tricks for food. That is how dogs are. After they've learned the trick, you can give them food at random intervals, and then eventually they will simply do it from habit. It's not a short process.

Also, lots of dogs have trouble with the Speak command. He probably doesn't understand what you want. Why do you assume that he is defying you?

To control barking, just try putting some pennies in a can, and shake them whenever he barks. I don't know if that will be effective since he is not your dog and he will need to be trained consistently, but most dogs learn to be quiet very quickly, so you may be able to do it in one visit.

I get the impression this dog's needs for training, attention, exercise and LOVE are not getting met. And for that matter, safety. What if a coyote comes INTO the yard, what good does the invisible fence do at that point?

Finally, as opposed to Speak, the Come command is VERY easy to teach. Why don't you teach him that one? There are lots of threads here on how to teach that one.