[kjc]

My MIL used a can with pennies.. and it always scared the heck out of me, lol! (She did not have Yorkies though)

Fighting: You will have to take 2 days in a row and concentrate on these dogs. Watch them closely for signals they will give, right before they start fighting. If you can separate them safely, without you getting bit, fine. If not , put leashes on them to separate them in a fight. When you learn what signals they are giving, sit and watch them.

When you see a signal, do a correction immediately, before he acts on it. A correction can be an 'Ah, Ah' and grab the leash, and stand between him and the other dog, blocking his view, and make sure he's paying attention to you. Then step towards him and make him back up, then make the dog sit. Keep him sitting until he becomes calm. Then release him from the sit by saying 'Okay' and drop the leash. If he has not calmed down enough, he may go right back to fighting. Do it again, but make the 'sit' last longer, till fighting is out of his mind.

Signals can be staring, becoming still like a statue, etc., or a combination. Then, if you figure out who is starting the fights, you can concentrate your attention on that particular dog. If both take turns starting the fights, do the correction first on the dog that starts the fight.

Attacking the vaccum: Pull the vacuum out. Have your dogs in the room, leashes on. Turn the vacuum on. When they start to attack or bark, step forward and get between the dogs and the vacuum. Tell them 'No', or ' Ah, Ah'. Step towards them and make them move backward away from you. Make them sit till calm, then walk back to the vacuum and start again.

If you cannot work with both dogs at the same time (depending on their level of excitement), then work with one at a time until they listen to you. Then work with them together. Be serious and firm with them, sound like you mean it.

Attacking feet: Other peoples feet? Get a person to walk past them (on leashes). When they go for the feet, do the correction 'Ah, Ah', get between the person and your dogs, make them get back and sit till they are calm. Then, release them ('Okay') and have the person walk by again.
They will probably give a signal, if you spot it, do the correction immediately and always follow through.

Don't use their names when giving any corrections. You will have to catch them in the act to do a correction (signaling is the beginning of the act). When you correct them during signaling, they will learn quicker, bc their excitement level is lower at that time, than if you miss the signals, and their excitement escalates.

Once they do right, and are being good, praise them, and give them treats. So anytime everyone is sitting around and not fighting, say 'Good dogs' and treat them. When they ignore the vacuum, stop and praise them and give them a treat. When feet go past and they do nothing, praise and reward.

You want to interrupt bad behavior, and reward the good behavior. If you only stop the bad behavior, they won't know what you do want them to do, or what is acceptable. Rewarding good behavior is how they learn what makes you happy.