Enables substance P receptor activity. Involved in several processes, including learning or memory; positive regulation of secretion; and regulation of cell migration. Located in several cellular components, including cell body; cell surface; and dendrite. Used to study central sleep apnea; cystitis; pancreatitis; and pulmonary hypertension. Biomarker of acute necrotizing pancreatitis; allergic rhinitis; asthma; colitis; and respiratory syncytial virus infectious disease. Human ortholog(s) of this gene implicated in exercise-induced bronchoconstriction. Orthologous to human TACR1 (tachykinin receptor 1). [provided by Alliance of Genome Resources, Apr 2022]