Because reality TV attracts extroverts, only the most peculiar and outlandish get invited back. Tonight’s “Trading Spouses: Meet Your New Mommy” (8 p.m., Fox) features the return of Marguerite Perrin. Fans of the series may recall her as the self-proclaimed “God warrior” who offered a prolonged proclamation against the “dark side” and experienced a major meltdown in front of the cameras.

Although memorable, Perrin may not be entirely recognizable. She used money from her first appearance to pay for gastric bypass surgery and dropped nearly 100 pounds since her last appearance. “Meet Your New Mommy” indeed.

¢ Was the Miss America pageant the first “reality” TV show? It certainly has inspired many series, most notably “The Bachelor” and its imitators. Now the pageant itself has become a reality show.

“Pageant School: Becoming Miss America” (8 p.m., CMT) features all 52 contestants for the coveted tiara as they gather at a posh Los Angeles location to refine their looks and presentation in anticipation of the big event, airing Monday night on CMT.

A battery of beauty wizards will be on hand to lend their expertise. Coaches include former Miss America runner-up Erika Schwarz-Wright and Miss America 2006 Jennifer Berry, Miss America 1971 Phyllis George, Miss America 2001 Angela Perez Baraquio and famed pageant coach Dale Smith Thomas. Official pageant judges Delta Burke, Michael Feinstein and Debbie Allen also will visit and submit to a question-and-answer session.

¢ A week ago, I theorized that cable was turning to animals to appeal to family viewers. The trend continues in ways large and small. In fact, you could say Friday nights have gone to the dogs.

Cesar Millan confronts three sets of wayward canines on “The Dog Whisperer” (7 p.m., National Geographic). “Ms Adventure” (8 p.m., Animal Planet) explores the ways that critters of all kinds attract and keep a mate.

The animal casting doesn’t stop with nature shows. Movie stars Will Smith and Tommy Lee Jones share screen time with a gruff pug named Frank in the 2002 sci-fi spoof “Men in Black II” (7 p.m., TBS). And while we’re on the subject of alien dogs who are not what they seem, the 2002 animated musical “Lilo & Stitch” (8 p.m., Disney) tells the tale of a lonely girl who befriends a dog from out of this world.

Tonight’s other highlights

¢ It’s a “Party of Five” reunion as Melinda deals with a not-so-friendly ghost on “Ghost Whisperer” (7 p.m., CBS). Lacey Chabert guest stars. Former “Five” star Matthew Fox appears on “Late Night with David Letterman,” too. Those orphaned Salinger kids sure get around.

¢ Annabeth pokes holes in a widow’s defense on “Close to Home” (8 p.m., CBS).

¢ Three players fleece the casino on “Las Vegas” (8 p.m., NBC).

¢ Natalie suspects foul play after her parent’s neighbors are found dead on “Monk” (8 p.m., USA).

¢ A disturbed woman kidnaps Megan on “Numb3rs” (9 p.m., CBS).

¢ A TV news ambush of an alleged predator has fatal consequences on “Law & Order” (9 p.m., NBC).

¢ Scheduled on “20/20” (9 p.m., ABC): children growing up in dire poverty in Camden, N.J.