There are many types of volunteer opportunities available and at all levels of frequencies. You can literally be in any location.
*Transporting animals from kill shelters to safe locations
*Transporting collected food/supplies to rescues and other non-profit groups
*Collecting food, supplies, etc.
*Fostering an animal in need
*Administrative tasks (if you can design a website, flyers, etc. YAY)
* Fundraising
*Bathing/Grooming
*Cleaning and/or maintaing empty transport kennels