If you do go two pages, and even if it is one page, get the important stuff on there first. What is important varies from job to job. Often it is experience or degrees/certifications. If many of your jobs have had similar duties, it may be easier to list those under a category, then list positions. For example:
Husbandry Experience:
- Fed and turned out horses at 30 stall stable
- Groomed 6-12 coated dogs per 8 hour shift
- Assisted in restraining goats and sheep for hoof trimming.
Veterinary Experience:
- Administered vaccinations under indirect supervision
- Prepared dogs and cats for routine surgery, including anesthesia monitoring.
Employment:
Wild Zoo, Quincy, IL 5/81-8/85
Big Acres Farm, Farra, MN 10/85-1/90
Blessed Ones Animal Clinic, Daygo, MI 2/90-8/99
Also, don't go crazy with fonts and such, but a bit of bolding and/or underlining on category headings can help. If you are responding to postings/ads, give them what they say they want (tailor the resume.) If you are shotgunning, go for the big categories in that field.