I need to remove the agitator to replace the agitator dogs but there is no bolt head to unscrew is there a special tool for this model 11022912101 series 90

This assumes that you have a basic Kenmore / Whirlpool top load, direct drive, neutral drain (it doesn't spin until the pump removes most of the water) machine.

First, see the Sears parts site for your washer:
http://www.searspartsdirect.com/partsdirect/index.action

http://www.searspartsdirect.com/partsdirect/getModel!retrieve.pd?modelNumber=110.22912101&pathTaken=partSearch

look at the diagrams for the agitator, basket and tub and you should see how the top components of the agitator fit.

See the part "Dog, agitator "

Remove the fabric softener unit, lift the top agitator cap (use a screwdriver) and you should see a plastic part in the center of the top agitator with a 1/2" square drive.

Remove the drive and lift off the top agitator. Turning it over you should see the 4 "dogs", replace these and the top agitator should turn in one direction only.

Replace the 1/2" drive, the cap and fabric softener unit and the top agitator should work.

Also see the following illustrated description of the above.

http://www.american-appliance.com/catalog/newsdesk_info.php?newsPath=16&newsdesk_id=136&osCsid=0da65cea0e338fe930b1fde153a243f0