Ask someone at the reference desk of your local public library for the Occupational Outlook Handbook. It lists all kinds of information you would need to know,(including the salary) of just about any occupation you can think of.
Firstly I envy you for wantting to become an animal cruelty investirgator. An animal cruelty investigator is what this earth is short of. What you need to qualify to be an animal cruelty investigator...
I'm currently doing an assignment for my uni and in south Australia OffenceFineImprisonment Aggravated Animal Cruelty $50,000 4 Years Keeping Animals in Conditions Likely to Cause Pain $20,00 2 Years...
It depends where you live. An animal trainer typically earns $31,080 in the United States. This makes it better paid than most personal care or service workers.