any work done for any firm or entity should be done after getting the consent of your sponsor. Even volunteer work.
your sponsor is responsible for your health and safety. let aside that you have to work for him and that you should have enough rest to be able to work properly. Now let me give an example. Some firms have their staff insured (medical/life/workmen compensation/etc). So. If the volunteer get an injury while cleaning the beaches or caring for the pets. in such a case, who will be responsible? if the volunteer takes care of her/his treatment, then who will compensate the sponsor in case the volunteer is unfit for duty and get a medical report for a long period?

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