If you suspect child abuse or neglect, do not hesitate to report it. All states require this of teachers. Some states require teachers to immediately report even suspicions of abuse or neglect. Others expect cases to be fairly well documented. Know the guidelines for your state and school district.
All states provide reporting teachers with immunity.
As a rule, failure to provide adequate food, water, and shelter or the use of physical force sufficient to leave a mark or otherwise cause injury constitutes cruelty to animals according to most state laws. Your actions may not only help the animal, but may also identify a person in need of help. Intervention can prevent escalation of abuse. Don't assume someone else would know if something was wrong. Be ready and willing to testify against abuse and neglect.