The present research examines relationships between humans and their pets through the lens of the Rusbult Investment Model. The Rusbult Investment Model identifies important antecedents to commitment in a relationship: satisfaction with the relationship, quality of alternatives to the relationship, and investments in the relationship. In turn, commitment predicts enactment of behaviors that involve forgoing one’s own needs to benefit one’s relationship. Among these behaviors are forgiving transgressions, accommodating undesirable behaviors, and sacrificing for the sake of one’s relationship partner. Recent research has revealed that pets benefit humans through conferral of social support. By examining commitment processes in human-pet relationships, relationship duration may be maximized, leading to greater benefits for both the human and the pet. The present research surveyed pet owners about their relationship with their pet (e.g., feelings of commitment, investment) and their willingness to engage in pro-relationship behaviors (e.g., forgiveness, accommodation). Regression analyses revealed that human-pet relationships operate in a similar fashion to human-human relationships in terms of both the predictors and outcomes of commitment. This effect was observed across a range of behaviors, among different types of pets (i.e., dogs, cats, and one fish), and in the context of both current and former relationships. These results suggest that increasing satisfaction and investments and decreasing the perceived quality of one’s alternatives, either individually or in concert with one another, may benefit human-pet relationships. The findings are discussed in terms of the role these factors may play in pet abandonment and its costs to animal well-being. This discourse erects a call for experimental and intervention-focused research that might draw upon both the present and past research on commitment to pets.