Alfonz

 is a background character.

Biography
He and 3rd Grade Male Dog (Number 2) played chess in the park until they saw Pal choking on The Tough Customers's litter. He ran to Pal and gave him the Heimlich maneuver, later saying that he knew there was a reason he went to medical school.

Buster tries to sell him chocolate in "Buster's Sweet Success," but he says that he is allergic, and even the word 'chocolate' gives him a rash. Strangely, he later buys a box of Buster Clusters after hearing that they are homemade.

He stands next to Unknown Male Alligator at the U-Stink concert.

Arthur

 * 125b. Arthur Cleans Up
 * 505a. The Lousy Week
 * 602b. Buster's Sweet Success
 * 805b. Sue Ellen Chickens Out
 * 1401b. The Buster Report
 * 1504b. Cents-less
 * 1710a. Binky's Music Madness
 * 1804b. The Tardy Tumbler

Specials

 * Arthur, It's Only Rock 'n' Roll

Trivia

 * He looks similar to Unknown Male Adult Bear (Number 4).