Most veterinary programs like to see biology and chemistry in your applications - these seem to be typical requirements for post secondary veterinary programs, although vet tech programs tend to be a little lighter I think. You could work at pet stores, volunteer with rescue groups or animal education programs in the area, or some service dog training places will let you volunteer. If you have horse farms in your area, sometimes they'll take volunteers - its hard work but a lot of fun if you like animals! Some vet clinics will hire students as well, especially if you're looking to go into that sort of thing as a profession. If you're in high school, you can see if your school has a co-op program. At my school we do and you can have the option to do a placement at a vet clinic if you want.
