Registrations can be deleted from the form during the Add Animal action, or by editing the animal's Profile page. 

Deleting a registration

Step 1:  On the Add Animal form, or when editing the animal's Profile page, click the Delete link on the Registration you want to remove:

Step 2: Select the new Primary Registration by clicking the radio button associated with the Registration (if two or more Registrations remain):

Step 3: If you are deleting the Registration from the Edit Profile page, click the Save button at the bottom of the form: