Enables leptin receptor activity. Involved in several processes, including energy homeostasis; leptin-mediated signaling pathway; and positive regulation of cold-induced thermogenesis. Acts upstream of or within several processes, including glial cell proliferation; glycogen metabolic process; and negative regulation of gluconeogenesis. Predicted to be located in extracellular space and plasma membrane. Predicted to be part of receptor complex. Predicted to be active in external side of plasma membrane. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; limb segment; and skeleton. Used to study non-alcoholic fatty liver disease; obesity; and type 2 diabetes mellitus. Human ortholog(s) of this gene implicated in several diseases, including artery disease (multiple); non-alcoholic fatty liver disease (multiple); obesity; obstructive sleep apnea; and type 2 diabetes mellitus. Orthologous to human LEPR (leptin receptor). [provided by Alliance of Genome Resources, Apr 2022]