[funkydunk]

I am assuming that you haven't changed the name of the field in the database but on on the customer facing stuff/language file.

Change the <input type=text name=pet_name size=32 maxlength=32 value="{$userinfo.pet_name}">
to
<input type=text name=ssn size=32 maxlength=32 value="{$userinfo.ssn}">

and all should work with all the existing code taking the value from ssn and putting it into the right place in the database and then displaying it again.