You know Frasier's been around too long when the dog gets fired for old age. Moose, the 13-year-old Jack Russell terrier who has played Martin's mischievous sidekick Eddie for 10 seasons, has been replaced by son Enzo. But the celeb pet remains a fixture on the sitcom's Paramount set. "Moose misses it," dog trainer Mathilde DeCagny tells the Los Angeles Times. "He comes once a week, otherwise he feels left out."