Lainey Custer is one of the pre-made NPC obedience trainers in Pets from The Sims 2: Pets. The other two obedience trainers are Arcadia Carr and Autumn Raha. She can be made playable by befriending and asking her to move in, or by marrying her.
Lainey has the same facial structure as Ashlee Kalson. According to her SimDNA in SimPE, her hair was brown before it turned grey. Lainey's name is randomized when Pets is generated. The name "Lainey Custer" is only referenced in the game files.
Despite being a Knowledge Sim, Lainey has the lifetime want to reach the top of the Athletic career. This want makes her compatible, at least in theory, with a Fortune, Popularity, or Romance Sim, though she would have better chemistry with a Family Sim.