We were usually always fortunate enough to have a friend/neighbor/partner who could take care of things whenever the need arose for us to leave for awhile.

My recommendations, while I don't know if they have already been mentioned or not, is contact your local Vo-Ag instructor or FFA chapter to get a list of students who might have the skill to come feed and care for your animals. While teenagers sometimes are not as diligent as adults, and may lack the level of skill you want, you can also check with your local saddle club to see if there are any members who would be willing to do some chores in an emergency or to allow you to go on a vacation.

Just my thoughts.
Kevin