Enables guanyl-nucleotide exchange factor activity and small GTPase binding activity. Involved in positive regulation of GTPase activity. Predicted to be located in membrane. Is expressed in extraembryonic component; forelimb bud; and forelimb bud mesenchyme. Orthologous to human DOCK9 (dedicator of cytokinesis 9). [provided by Alliance of Genome Resources, Apr 2022]