ʘʘʘʘʘʘʘ: follow me!
ǁǁǁǁ: giddy-ap! (?)
The interesting question here is: to what extent are these arbitrary, reflecting an emergent cross-species convention just as most human lexemes do, versus to what extent do they reflect innate properties of animal perception and communication? How do they compare to those you've encountered, if any?