Enables dopamine binding activity; dopamine neurotransmitter receptor activity, coupled via Gi/Go; and heterocyclic compound binding activity. Involved in several processes, including behavioral fear response; learning or memory; and modulation of chemical synaptic transmission. Located in several cellular components, including dendritic spine; neuronal cell body; and terminal bouton. Is active in GABA-ergic synapse and glutamatergic synapse. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Biomarker of attention deficit hyperactivity disorder and obesity. Human ortholog(s) of this gene implicated in several diseases, including Gilles de la Tourette syndrome; antisocial personality disorder; attention deficit hyperactivity disorder; conduct disorder; and dyslexia. Orthologous to human DRD4 (dopamine receptor D4). [provided by Alliance of Genome Resources, Apr 2022]