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So to start, you can buy just the agitator dogs. Below is a link to the kit you'd need to order and replace for your model. They are less than $4.
CLICK HERE for agitator dogs
Now as for the washer shaking too much, first try to level the washer. The washer has automatic rear adjustment legs. If you tilt/pull the washer forward and set it back down quickly, the rear legs should auto adjust to level out the washer. Try the washer again. If it still goes out of balance, then you'd need to remove the entire outer shell and make sure none of the springs along the bottom of the tub are not broken. If you find a broken spring, replace it. If everything checks good--the skate plate which sits between the bottom of the outer plastic tub and the tub support frame below the tub is just wearing out and the skate plate would need to be replaced. That's a gradual issue that gets worse when the skate plate wears out, but unfortunately it's not easy to replace at all since the entire tub must be removed so for this you may need a technician.
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