What is the name of Bart Simpson's dog?

After a mail call, Bart complains that he doesn't get any mail, so Marge lets him have the junk mail. Most of them are termite ads, one of them is a credit card application and Bart fills it under the name of his dog, Santa's Little Helper, his income, "whatever I finds I keeps," and claims the occupation to be "butt doctor". The company misreads the name as "Santos L. Halper", and the credit card application is approved. Before long, Bart receives a credit card.