Santa's Little Helper the dog was a "sympathetic" character. Welker has been praised by staff members for his performances on the show. David Mirkin has noted that "he can do anything, and it fits perfectly. You forget you're listening to a guy, and he's a pleasure to work with." Groening has commented that he was "unbelievably good" at doing animal noises. After 1995, Castellaneta voiced Santa's Little Helper on his own while Welker performed other animal noises until his full departure in 2002, when he was denied a pay raise. In the "questions and answers" section on his website, Welker revealed that the
Good Night (The Simpsons) and looking a little worse for wear." DVD Movie Guide says, "I’ve seen a few additional Ullman shorts and think they’re nearly unwatchable, so I can’t say I miss them, at least not for their entertainment value. However, they’d make a nice historical addition, so it’s too bad we only get this single clip. The first one ever aired, “Good Night Simpsons” runs for 115 unfunny seconds." The Digital Fix says the short extra on the DVD "showcases the superb sense of humour that has made The Simpsons what it is today", and that "the picture quality is quite breathtaking