When you encounter it early game and you have a spear, I do this firstly they knock me back before they spit out the acid always stay the same direction they actually blind you in the same direction there an easy kill
They make a distinct aggro sound when they lock onto you, keep this in mind when one is nearby. They are easily outrun and with very little practice you can avoid their arcing acid attack. Spears/arrows to he head are very effective
Ever seen Jurassic Park? If not be aware, to the average new player they seem like an easy hunt. But do not let their small size fool you. These creatures can hurt even high level players. If you have to fight one try jumping around a lot to avoid getting blinded. Good luck!