Some key points to a great resume:

• Keep it to one page. Having references on a second page is acceptable.
• Reduce and simplify wording.  Bullet items or short concise phrases verses story or paragraph format.
• Select items that make you stand out from everyone else that has a love for animals.
• Objective statement: Be direct and specific about what you are applying for, adapting it to the circumstance/job you are seeking. 
• Put most recent ANIMAL RELATED EXPERIENCES/SKILLS TRAINING at the top of any other work or education experience.
• SPELL CHECK!! Read and re-read your resume out loud, and to others. 
• Resume Mistakes to avoid: information available here