Question: Which character did Bill Melendez voice who was a pet beagle?

Context articles: Cathy's Last Resort
Bon Voyage, Charlie Brown (and Don't Come Back!!)
Cathy's Valentine
Charlie Brown's All Stars!
Bill Melendez
Happiness Is a Warm Blanket, Charlie Brown
Melendez Films
Cathy (TV special)
Steven C. Melendez
Snoopy

Cathy's Last Resort is a 1988 animated television special based on the "Cathy" comic strip by Cathy Guisewite.
 It features Kathleen Wilhoite as the voice of Cathy Andrews, and was written by Guisewite, executive producer Lee Mendelson, produced by Bill Melendez, and directed by Evert Brown.
Bon Voyage, Charlie Brown (and Don't Come Back!!)
 is a 1980 American animated comedy-drama film produced by United Feature Syndicate and distributed by Paramount Pictures, directed by Bill Melendez and Phil Roman.
 It was the fourth full-length feature film to be based on the "Peanuts" comic strip, and was followed three years later by a 1983 television special, "What Have We Learned, Charlie Brown?
", in which the gang sees memorials and places related to World Wars I and II.
 It also use the same voice cast that worked on the 1979 Peanuts television special "You're the Greatest, Charlie Brown".
 This film contains a rare occurrence where the adults appear on screen, including having their faces entirely visible, as well as speaking comprehensible lines.
Cathy's Valentine is a 1989 animated television special based on the "Cathy" comic strip by Cathy Guisewite.
 It features Kathleen Wilhoite as the voice of Cathy Andrews, and was written by Guisewite, executive-produced by Lee Mendelson, produced by Bill Melendez, and directed by Evert Brown.
Charlie Brown's All Stars!
 is the second prime-time animated TV special based upon the popular comic strip "Peanuts," by Charles M. Schulz.
 It was the second such TV special (following "A Charlie Brown Christmas") to be produced by Lee Mendelson and Bill Melendez (who also directed), and originally aired on CBS on June 8, 1966.
 It ceased to be aired annually by 1971, and was last shown on CBS on April 3, 1982 (although Disney Channel and Nickelodeon aired reruns of the special in the 1990s).
 ABC returned the special to television on April 7, 2009, as a companion to "It's the Easter Beagle, Charlie Brown".
José Cuauhtémoc Meléndez (November 15, 1916 – September 2, 2008), known as Bill Melendez, was a Mexican American character animator, film director, voice artist and producer, known for his cartoons for Walt Disney Productions (working on four Disney films "Pinocchio", "Fantasia", "Dumbo" and "Bambi"), Warner Bros.
 Cartoons, UPA and the "Peanuts" series.
 Melendez provided the voices of Snoopy and Woodstock in the latter as well.
Happiness Is a Warm Blanket, Charlie Brown is a "Peanuts" television special that was released in 2011.
 The special is the 45th "Peanuts" special and the first produced without Bill Melendez on the production team.
 It is also the first special without the direct involvement of "Peanuts" creator Charles M. Schulz, Lee Mendelson Productions or Bill Melendez Productions (it is unknown, though, if Lee Mendelson also worked on this special).
 In addition, it is the first "Peanuts" special produced in part under Warner Bros.
 Television, which holds the home media distribution rights to the Peanuts specials.
Melendez Films is a film animation studio.
 It was founded in 1969 as a London subsidiary of Bill Melendez Productions (best known for producing the Peanuts specials) by Steven C. Melendez (son of animator Bill Melendez).
Cathy is a 1987 animated television special based on the "Cathy" comic strip by Cathy Guisewite.
 It features Kathleen Wilhoite as the voice of Cathy Andrews, and was written by Guisewite, executive-produced by Lee Mendelson, produced by Bill Melendez, and directed by Evert Brown.
Steven Cuitlahuac Melendez is an American film and television director, producer and animator.
 He is the second son of "Peanuts" animator Bill Melendez.
Snoopy is Charlie Brown's pet beagle in the comic strip "Peanuts" by Charles M. Schulz.
 He can also be found in all of the "Peanuts" movies and television specials, like "The Peanuts Movie".
 Since his debut on October 4, 1950, Snoopy has become one of the most recognizable and iconic characters in the comic strip.
 The original drawings of Snoopy were inspired by Spike, one of Schulz's childhood dogs.