Question: I suffer from thirst and fatigue while I am pasturing animals. May I break Sawm (Fast) in Ramadaan and make up the missed days later? May Allaah reward you with the best.
Answer: Pasturing is not a legal excuse that permits you to break Sawm in Ramadaan. It is obligatory upon you to observe Sawm and seek reward from Allaah in return for patience in enduring fatigue and thirst. In-shaa’ Allaah (if Allaah wills), Allaah (Exalted be He) will help you to do so... read more here.