Dogs are the most popular companion animal in almost all European countries, the USA, and Australia (Global survey on pet ownership, 2016). Dog ownership has been associated with several benefits to human physical and psychological health, including increased physical activity, reduced stress, companionship, social support, and increased social interactions with people (O'Haire, 2010).Unfortunately, not all human-dog relationships are healthy and pleasant. Problems associated with dogs (e.g., difficulties in training, soiling, and aggressive behavior, Greenebaum, 2006;O'Farrell, 1997) cause inconvenience and suffering for humans. A sub-optimal relationship might also cause suffering for the dog owing to maltreatment (e.g., neglect, Arluke, 2006), relinquishment to a shelter (Coe et al., 2014;Lambert, Coe, Niel, Dewey, & Sargeant, 2015), or disposal in other ways (e.g., through a trading website).These undesired situations are at least partly related to a mismatch between characteristics of the dog (e.g., size, age, breed, health, and behavior), the owner's knowledge and capabilities concerning the dog's needs, and the owner's expectations of the relationship with the dog. Mismatches are more likely when dogs are acquired impulsively (Jagoe & Serpell, 1996).Impulse buying involves an instantaneous, overpowering, and persistent desire to buy a product when exposed to it. Such purchases are unintended and non-reflective (Rook, 1987). Rook and Gardner (1993) define impulse buying as unplanned behavior involving quick decision-making and a tendency toward immediate acquisition of a product. Several factors have been associated with impulse buying (Muruganantham & Bhakat, 2013). For example, impulse buyers are more social and status-conscious, and they do not spend much time considering their purchases. When they feel a connection with a product, they simply must have it. Such connections can occur when the product is physically close, seen on a website, or associated with a person that one admires (de Veirman, Cauberghe, & Hudders, 2017). Impulse buying can be regarded as sub-optimal decision-making. The social-cognitive factors involved in decision-making are described in the Theory of Planned Behavior (Ajzen, 1991). In a previous study (Vink, Dijkstra, & Epstude, 2019), we demonstrate that certain aspects of the decision-making process at time zero (T0) are related to the actual acquisition of a dog (T1; yes/no). In the present study, we examine how aspects of the decision-making process at T0 are related to canine behavior problems and owner satisfaction, as measured in two follow-up questionnaires, six (T1) and 18 months (T2) after acquiring a dog. The variables addressed in the present study call for a different theoretical framework: the two-phase model of owner-dog relationship establishment.Weighing advantages and disadvantages is central to making decisions (Dwyer, Bennett, &