Enables dipeptide transmembrane transporter activity; peptide:proton symporter activity; and proton-dependent oligopeptide secondary active transmembrane transporter activity. Involved in dipeptide import across plasma membrane. Acts upstream of or within oligopeptide transport. Located in brush border. Is integral component of membrane. Orthologous to human SLC15A1 (solute carrier family 15 member 1). [provided by Alliance of Genome Resources, Apr 2022]