Walter is a canine character in DEXTER. He is a Beagle-breed of puppy, belonging to an unknown male that had dated Rita's Neighbor and then left his dog with the neglectful woman. She kept Walter outside at all hours and ignored him, despite how much he barked. The continual noise caused Rita Bennett, as well as her kids, discomfort and sleepless nights. Her boyfriend, Dexter Morgan, tried to reason with the woman about improving the situation, but she ignored him. Dexter considered "alternative means" to take care of Rita's problem with the puppy, but decided that it would be "wrong" to do so.
Rita later tried to deal with the neighbor herself but met with the same resistance. Subsequently, she chose to help the poor puppy by stealing it from her neighbor's backyard. Rita then delivered Walter to Yelina, her friend at work, and her two nieces. Rita simply required that Walter would be loved and cared for by them, unlike with his previous owner.